Make warnings about uninitialized fields include the field name.

This makes the wording more informative, and consistent with the other
warnings about uninitialized variables.

Also, me and David who reviewed this couldn't figure out why we would
need to do a lookup to get the name of the variable; so just print the
name directly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164366 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index 15ef5ea..03cec4c 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -1717,7 +1717,7 @@
           unsigned diag = VD->getType()->isReferenceType()
               ? diag::warn_reference_field_is_uninit
               : diag::warn_field_is_uninit;
-          S.Diag(ME->getExprLoc(), diag);
+          S.Diag(ME->getExprLoc(), diag) << ME->getMemberNameInfo().getName();
           return;
         }
       }