For class template implicit instantiation, also update its location to point

to the pattern template that it came from, otherwise we had this situation:

template <typename T1, typename T2>
struct S {
};

template <typename T>
struct S<T, int> {
};

void f() {
  S<int, int> s; // location of declaration "S<int, int>" was of "S<T1, T2>" not "S<T, int>"
}

llvm-svn: 150290

clang/lib/Sema/SemaTemplateInstantiate.cpp

@@ -1863,6 +1863,7 @@ Sema::InstantiateClass(SourceLocation PointOfInstantiation,
     ActOnFinishDelayedMemberInitializers(Instantiation);
 
   if (TSK == TSK_ImplicitInstantiation) {
+    Instantiation->setLocation(Pattern->getLocation());
     Instantiation->setLocStart(Pattern->getInnerLocStart());
     Instantiation->setRBraceLoc(Pattern->getRBraceLoc());
   }