[llvm] [SPIRV] Addition of extension SPV_KHR_non_semantic_info and SPV_KHR_relaxed_extended_instruction (PR #169643)

[Juan Manuel Martinez Caamaño via llvm-commits]

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@@ -133,6 +136,27 @@ class SPIRVGlobalRegistry : public SPIRVIRMapping {
     return It == FunResPointerTypes.end() ? nullptr : It->second;
   }
 
+  Register getDebugValue(const Metadata *MD) const {
+    auto It = MDMap.find(MD);
+    if (It != MDMap.end())
+      return It->second;
+    return Register();
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jmmartinez wrote:

Nitpick:
```suggestion
    return MDMap.lookup(MD);
```

https://github.com/llvm/llvm-project/pull/169643