Undefined-shift in __perm_str_to_datum

```
../cil/src/cil_binary.c:1243:14: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
    #0 0x4c95f0 in __perm_str_to_datum /src/selinux/src/../cil/src/cil_binary.c:1243:14
    #1 0x4c968b in __cil_perms_to_datum /src/selinux/src/../cil/src/cil_binary.c:1263:8
    #2 0x4c9953 in __cil_avrule_expand_helper /src/selinux/src/../cil/src/cil_binary.c:1335:7
    #3 0x4c9bf3 in __cil_avrule_expand /src/selinux/src/../cil/src/cil_binary.c:1374:10
    #4 0x4ca0fa in __cil_avrule_to_avtab /src/selinux/src/../cil/src/cil_binary.c:1448:9
    #5 0x4ca8a5 in cil_avrule_to_policydb /src/selinux/src/../cil/src/cil_binary.c:1533:9
    #6 0x4d2c4c in __cil_node_to_policydb /src/selinux/src/../cil/src/cil_binary.c:3756:11
    #7 0x4d3345 in __cil_binary_create_helper /src/selinux/src/../cil/src/cil_binary.c:3803:7
    #8 0x517a17 in cil_tree_walk_core /src/selinux/src/../cil/src/cil_tree.c:272:9
    #9 0x517bf8 in cil_tree_walk /src/selinux/src/../cil/src/cil_tree.c:316:7
    #10 0x517abf in cil_tree_walk_core /src/selinux/src/../cil/src/cil_tree.c:284:9
    #11 0x517bf8 in cil_tree_walk /src/selinux/src/../cil/src/cil_tree.c:316:7
    #12 0x517abf in cil_tree_walk_core /src/selinux/src/../cil/src/cil_tree.c:284:9
    #13 0x517bf8 in cil_tree_walk /src/selinux/src/../cil/src/cil_tree.c:316:7
    #14 0x4d4b3d in cil_binary_create_allocated_pdb /src/selinux/src/../cil/src/cil_binary.c:4865:8
    #15 0x4d476f in cil_binary_create /src/selinux/src/../cil/src/cil_binary.c:4238:7
    #16 0x4bc102 in cil_build_policydb /src/selinux/src/../cil/src/cil.c:631:7
    #17 0x4af94b in LLVMFuzzerTestOneInput /src/secilc-fuzzer.c:62:6
    #18 0x440f43 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #19 0x42c6b2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #20 0x432356 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #21 0x45b862 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #22 0x7fdfc7dfeb26 in __libc_start_main (/lib64/libc.so.6+0x25b26)
    #23 0x408569 in _start (/root/oss-fuzz/build/out/selinux/secilc-fuzzer+0x408569)
```

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