[clang] [llvm] [llvm][opt][Transforms][SPIR-V] Enable `InferAddressSpaces` for SPIR-V (PR #110897)

[Alexey Bader via cfe-commits]

================
@@ -92,6 +98,65 @@ SPIRVTargetMachine::SPIRVTargetMachine(const Target &T, 
const Triple &TT,
   setRequiresStructuredCFG(false);
 }
 
+enum AddressSpace {
+  Function = storageClassToAddressSpace(SPIRV::StorageClass::Function),
+  CrossWorkgroup =
+      storageClassToAddressSpace(SPIRV::StorageClass::CrossWorkgroup),
+  UniformConstant =
+      storageClassToAddressSpace(SPIRV::StorageClass::UniformConstant),
+  Workgroup = storageClassToAddressSpace(SPIRV::StorageClass::Workgroup),
+  Generic = storageClassToAddressSpace(SPIRV::StorageClass::Generic)
+};
+
+unsigned SPIRVTargetMachine::getAssumedAddrSpace(const Value *V) const {
+  // TODO: we only enable this for AMDGCN flavoured SPIR-V, where we know it to
+  //       be correct; this might be relaxed in the future.
+  if (getTargetTriple().getVendor() != Triple::VendorType::AMD)
+    return UINT32_MAX;
----------------
bader wrote:

Can we add `AddressSpace::Unknown`/ `AddressSpace::Invalid` instead of using 
magic constant or at least document the meaning of `UINT32_MAX`?

https://github.com/llvm/llvm-project/pull/110897
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