[llvm] [SPIRV] Emit NonSemantic DebugGlobalVariable (PR #207230)

[Manuel Carrasco via llvm-commits]

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@@ -561,6 +586,90 @@ std::optional<MCRegister> SPIRVNonSemanticDebugHandler::mapDISignatureTypeToReg(
   return lookupOptReg(DebugTypeRegs, Ty);
 }
 
+std::optional<MCRegister>
+SPIRVNonSemanticDebugHandler::resolveGlobalVariableParent(
+    const DIGlobalVariable *GV) const {
+  // TODO: When this backend emits debug instructions for namespace, subprogram,
+  // and module scopes, return GV->getScope()'s debug id.
+
+  // Fallback: first module compile unit (SPIRV-LLVM-Translator default).
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mgcarrasco wrote:

The TODO and the fallback are orthogonal because a DIGlobalVariable GV can return null for `GV->getScope()` (valid IR). When the TODO is implemented, this edge case must still be handled.

https://github.com/llvm/llvm-project/pull/207230