[clang] Add source file name for template instantiations in -ftime-trace (PR #98320)

[Ilya Biryukov via cfe-commits]

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@@ -3430,6 +3430,7 @@ Sema::InstantiateClass(SourceLocation PointOfInstantiation,
     llvm::raw_string_ostream OS(Name);
     Instantiation->getNameForDiagnostic(OS, getPrintingPolicy(),
                                         /*Qualified=*/true);
+    OS << ", file:" << SourceMgr.getFilename(Instantiation->getLocation());
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ilya-biryukov wrote:

I think we might need to get the spelling location / expansion location first.
Could you check for instantiations coming from various complicaged source locations and make sure we're doing the right thing??
- from macro expansions,
- from macro arguments,
- from concatenation operator `##`?

https://github.com/llvm/llvm-project/pull/98320