Tweak diagnostic wording for init list narrowing

The conventional form is '<action> to silence this warning'.

Also call the diagnostic an 'issue' rather than a 'message' because the latter
term is more widely used with reference to message expressions.

llvm-svn: 209052
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index ca7a92e..7974b6f 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -3961,11 +3961,11 @@
   SourceRange SizeRange = Size->getSourceRange();
   S.Diag(Size->getOperatorLoc(), diag::warn_memsize_comparison)
       << SizeRange << FnName;
-  S.Diag(FnLoc, diag::warn_memsize_comparison_paren_note)
+  S.Diag(FnLoc, diag::note_memsize_comparison_paren)
       << FnName << FixItHint::CreateInsertion(
                        S.getLocForEndOfToken(Size->getLHS()->getLocEnd()), ")")
       << FixItHint::CreateRemoval(RParenLoc);
-  S.Diag(SizeRange.getBegin(), diag::warn_memsize_comparison_cast_note)
+  S.Diag(SizeRange.getBegin(), diag::note_memsize_comparison_cast_silence)
       << FixItHint::CreateInsertion(SizeRange.getBegin(), "(size_t)(")
       << FixItHint::CreateInsertion(S.getLocForEndOfToken(SizeRange.getEnd()),
                                     ")");