Kai Luo 56414220df [PowerPC] Use 'sync; ld; cmp; bc; isync' for atomic load seq-cst on 32-bit platform (#75905) ...

`cmp; bc; isync` is more performant than `lwsync` theoretically.

64-bit platform already features it, now implement it for 32-bit
platform.

2023-12-20 10:01:02 +08:00

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