Rename test.cc files to test.cpp.

The lit.cfg files only add .cpp to suffixes, so these tests used to never run,
oops.  (Also tweak to of these tests in minor ways to make the actually pass.)

llvm-svn: 224718

clang/test/CodeGen/builtin-recursive.cpp

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -nostdsysteminc -nobuiltininc -isystem Inputs -emit-llvm-only %s
+// RUN: %clang_cc1 -nostdsysteminc -nobuiltininc -isystem %S/Inputs -emit-llvm-only %s
 
 // This used to cause a read past the end of a global variable.
 

clang/test/SemaCXX/vtable-instantiation.cpp

@@ -41,7 +41,7 @@ namespace PR9325 {
 
   void f()
   {
-    Target<int*>* traits = &Provider<int*>::Instance;
+    Target<int*>* traits = &Provider<int*>::Instance; // expected-note{{requested here}}
   }
 }
 
@@ -60,7 +60,7 @@ namespace PR10020 {
   };
 
   template <typename Type>
-  GMG<Type> GMG<Type>::singleton;
+  GMG<Type> GMG<Type>::singleton; // expected-note{{requested here}}
 
   void test(void) {
     GMG<int>::Method(); // expected-note{{in instantiation of}}