[PATCH] Instantiate incomplete class used in template method.

[Richard Smith]

================
Comment at: lib/Sema/SemaTemplateInstantiateDecl.cpp:4406-4407
@@ +4405,4 @@
+      const TagDecl *DeclToInstantiate = nullptr;
+      if (TagDecl *Def = TD->getDefinition())
+        DeclToInstantiate = Def;
+      else if (!TD->isThisDeclarationADefinition() && !TD->isFreeStanding())
----------------
What's the purpose of this change? If we have a reference to a particular `TagDecl`, why don't we always instantiate that declaration?

http://reviews.llvm.org/D8281

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