[clang] [clang] Fix FoldingSet lookups that disagree with the node's Profile (PR #220168)

[Fangrui Song via cfe-commits]

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@@ -4115,8 +4115,10 @@ void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID, QualType Result,
 
 void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID,
                                 const ASTContext &Ctx) {
+  // getFunctionTypeInternal keys every node canonically and compares noexcept
+  // expressions after the lookup, so report that same key.
   Profile(ID, getReturnType(), param_type_begin(), getNumParams(),
-          getExtProtoInfo(), Ctx, isCanonicalUnqualified());
+          getExtProtoInfo(), Ctx, /*Canonical=*/true);
 }
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MaskRay wrote:

Removed the parameter

https://github.com/llvm/llvm-project/pull/220168