Alex Voicu 3cfd0c0d36
[SPIRV][RFC] Rework / extend support for memory scopes (#106429)
This change adds support for correctly lowering the `__scoped` Clang
builtins, and corresponding scoped LLVM instructions. These were
previously unconditionally lowered to Device scope, which is possibly incorrect. 
Furthermore, the default / implicit scope is changed from Device (an 
OpenCL assumption) to AllSvmDevices (aka System), since the SPIR-V BE is not 
OpenCL specific / can ingest IR coming from other language front-ends. OpenCL 
defaulting to Device scope is now reflected in the front-end handling of atomic 
ops, which seems preferable.
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