[clang] [RFC][clang] Handle friend function that was a definition but became only a declaration during AST deserialization (PR #132214)

[via cfe-commits]

================
@@ -2572,7 +2572,7 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(
   // Friend function defined withing class template may stop being function
   // definition during AST merges from different modules, in this case decl
   // with function body should be used for instantiation.
-  if (isFriend) {
+  if (isFriend && D->hasOwningModule()) {
----------------
cor3ntin wrote:

we can add bits by shrinking 

NumCtorInitializers.


however, in the present case it doesn't seem justified. these bits are precious.

https://github.com/llvm/llvm-project/pull/132214
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