James Y Knight 137f785fa6 [AMDGPU] Set MaxAtomicSizeInBitsSupported. (#75185) ...

This will result in larger atomic operations getting expanded to
`__atomic_*` libcalls via AtomicExpandPass, which matches what Clang
already does in the frontend.

While AMDGPU currently disables the use of all libcalls, I've changed it
to instead disable all of them _except_ the atomic ones. Those are
already be emitted by the Clang frontend, and enabling them in the
backend allows the same behavior there.

2023-12-18 16:51:06 -05:00

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