[llvm] [SPIR-V] Drop storage-class MemorySemantics bit for relaxed Vulkan atomics (PR #215802)

[Joshua Batista via llvm-commits]

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@@ -2141,7 +2141,9 @@ bool SPIRVInstructionSelector::selectAtomicLoad(Register ResVReg,
   uint32_t MemSem = static_cast<uint32_t>(getMemSemantics(AO));
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bob80905 wrote:

Is OpAtomicCompareExchange also available to modify in this way? Though it hasn't had a lowering implementation yet, maybe making a TODO calling out that this has to be done for that operation as well would be good.

https://github.com/llvm/llvm-project/pull/215802