Heap-use-after-free in ZEND_ASSIGN_DIM_SPEC_VAR_UNUSED_OP_DATA_VAR_HANDLER

```
=================================================================
==483262==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000014c88 at pc 0x000000e0fceb bp 0x7ffd2d211920 sp 0x7ffd2d211918
READ of size 8 at 0x603000014c88 thread T0
    #0 0xe0fcea in ZEND_ASSIGN_DIM_SPEC_VAR_UNUSED_OP_DATA_VAR_HANDLER /src/php-src/Zend/zend_vm_execute.h:27373:4
    #1 0xfa7ef9 in fuzzer_execute_ex /src/php-src/sapi/fuzzer/fuzzer-execute.c:40:14
    #2 0xde74d6 in zend_execute /src/php-src/Zend/zend_vm_execute.h:58856:2
    #3 0xfa8949 in fuzzer_do_request_from_buffer /src/php-src/sapi/fuzzer/fuzzer-sapi.c:259:5
    #4 0xfa7d9b in LLVMFuzzerTestOneInput /src/php-src/sapi/fuzzer/fuzzer-execute.c:69:2
    #5 0x63a673 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #6 0x625de2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #7 0x62ba86 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #8 0x654f92 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #9 0x7f45efda9b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)
    #10 0x601c99 in _start (/root/oss-fuzz/build/out/php/php-fuzz-execute+0x601c99)

0x603000014c88 is located 8 bytes inside of 32-byte region [0x603000014c80,0x603000014ca0)
freed by thread T0 here:
    #0 0x701132 in free /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:127:3
    #1 0xcfce84 in tracked_free /src/php-src/Zend/zend_alloc.c:2748:2
    #2 0xcf6437 in _efree_custom /src/php-src/Zend/zend_alloc.c:2427:3
    #3 0xcf6341 in _efree /src/php-src/Zend/zend_alloc.c:2547:3
    #4 0xd7a9a3 in zend_reference_destroy /src/php-src/Zend/zend_variables.c:75:2
    #5 0xd79be3 in rc_dtor_func /src/php-src/Zend/zend_variables.c:57:2
    #6 0xde19ce in zval_ptr_dtor_nogc /src/php-src/Zend/zend_variables.h:35:3
    #7 0xe0f6a6 in ZEND_ASSIGN_DIM_SPEC_VAR_UNUSED_OP_DATA_VAR_HANDLER /src/php-src/Zend/zend_vm_execute.h:27352:6
    #8 0xfa7ef9 in fuzzer_execute_ex /src/php-src/sapi/fuzzer/fuzzer-execute.c:40:14
    #9 0xde74d6 in zend_execute /src/php-src/Zend/zend_vm_execute.h:58856:2
    #10 0xfa8949 in fuzzer_do_request_from_buffer /src/php-src/sapi/fuzzer/fuzzer-sapi.c:259:5
    #11 0xfa7d9b in LLVMFuzzerTestOneInput /src/php-src/sapi/fuzzer/fuzzer-execute.c:69:2
    #12 0x63a673 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #13 0x625de2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #14 0x62ba86 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #15 0x654f92 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #16 0x7f45efda9b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

previously allocated by thread T0 here:
    #0 0x70139d in malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0xcf6a39 in __zend_malloc /src/php-src/Zend/zend_alloc.c:3030:14
    #2 0xcf39fe in tracked_malloc /src/php-src/Zend/zend_alloc.c:2733:14
    #3 0xcf6267 in _malloc_custom /src/php-src/Zend/zend_alloc.c:2418:10
    #4 0xcf616f in _emalloc /src/php-src/Zend/zend_alloc.c:2537:10
    #5 0xebf8b9 in ZEND_MAKE_REF_SPEC_VAR_UNUSED_HANDLER /src/php-src/Zend/zend_vm_execute.h:28518:4
    #6 0xfa7ef9 in fuzzer_execute_ex /src/php-src/sapi/fuzzer/fuzzer-execute.c:40:14
    #7 0xde74d6 in zend_execute /src/php-src/Zend/zend_vm_execute.h:58856:2
    #8 0xfa8949 in fuzzer_do_request_from_buffer /src/php-src/sapi/fuzzer/fuzzer-sapi.c:259:5
    #9 0xfa7d9b in LLVMFuzzerTestOneInput /src/php-src/sapi/fuzzer/fuzzer-execute.c:69:2
    #10 0x63a673 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #11 0x625de2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #12 0x62ba86 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #13 0x654f92 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #14 0x7f45efda9b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

SUMMARY: AddressSanitizer: heap-use-after-free /src/php-src/Zend/zend_vm_execute.h:27373:4 in ZEND_ASSIGN_DIM_SPEC_VAR_UNUSED_OP_DATA_VAR_HANDLER
Shadow bytes around the buggy address:
  0x0c067fffa940: fa fa 00 00 00 fa fa fa 00 00 01 fa fa fa 00 00
  0x0c067fffa950: 00 05 fa fa 00 00 00 fa fa fa 00 00 00 fa fa fa
  0x0c067fffa960: 00 00 00 fa fa fa 00 00 00 00 fa fa 00 00 00 fa
  0x0c067fffa970: fa fa 00 00 00 fa fa fa fd fd fd fd fa fa 00 00
  0x0c067fffa980: 00 00 fa fa 00 00 00 fa fa fa fd fd fd fa fa fa
=>0x0c067fffa990: fd[fd]fd fd fa fa 00 00 00 00 fa fa fa fa fa fa
  0x0c067fffa9a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c067fffa9b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c067fffa9c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c067fffa9d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c067fffa9e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
==483262==ABORTING
```

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