Add storage class memory semantics bit to LLVM IR atomic translation

[aobolensk]

Deduce storage class memory semantic from the pointer accessed by atomic intrinsics

Inspired by llvm/llvm-project#193696, llvm/llvm-project#195049

[MrSidims]

Per SPIR-V spec section 3.32 (Memory Semantics), atomic operations must combine the ordering bits ... with the relevant storage class bit ...

The description is misleading. There is no such spec requirement. Instead we should tell: deduce storage class memory semantic from the pointer accessed by atomic intrinsics

[aobolensk]

Per SPIR-V spec section 3.32 (Memory Semantics), atomic operations must combine the ordering bits ... with the relevant storage class bit ...

The description is misleading. There is no such spec requirement. Instead we should tell: deduce storage class memory semantic from the pointer accessed by atomic intrinsics

Modified description