[Sync] Sync patch from openeuler/gcc · Pull Request !181 · src-openEuler/gcc

Sync patch from openeuler/gcc - 20220629
Including:
[ccmp] Add another optimization opportunity for ccmp instruction
    https://gitee.com/openeuler/gcc/pulls/11
[StructReorg] Refactoring reorder fields to struct layout optimization
    https://gitee.com/openeuler/gcc/pulls/29
[backport] Optimize for loop invariant motion
    https://gitee.com/openeuler/gcc/pulls/32
[DFE] Add Dead Field Elimination in Struct-Reorg
    https://gitee.com/openeuler/gcc/pulls/30
[Backport] [ipa-sra] ipa-sra: Fix thinko when overriding safe_to_import_accesses
    https://gitee.com/openeuler/gcc/pulls/36
[Backport] ifcvt: Allow constants for noce_convert_multiple
    https://gitee.com/openeuler/gcc/pulls/39
[Backport] Register --sysroot in the driver switches table
    https://gitee.com/openeuler/gcc/pulls/40
[DFE] Fix bugs
    https://gitee.com/openeuler/gcc/pulls/35
[Backport] [ira] Fix unnecessary register spill
    https://gitee.com/openeuler/gcc/pulls/44
[Backport] [rtl] Extend special_memory_constraint
    https://gitee.com/openeuler/gcc/pulls/43

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