Kai Luo d9630c34f4 [PowerPC][GISel] Select sync instructions required by atomic operations ...

This is part of selecting `G_ATOMIC*` instructions. Select `isync`, `sync` and `lwsync` in GISel.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D141360

2023-01-11 16:25:46 +08:00

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