C++1y is now C++14!

Changes diagnostic options, language standard options, diagnostic identifiers, diagnostic wording to use c++14 instead of c++1y. It also modifies related test cases to use the updated diagnostic wording.

llvm-svn: 215982
diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index 4c18d54..65ee5f4 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -2012,7 +2012,7 @@
   LangOptions LangOpts;
   LangOpts.CPlusPlus = 1;
   LangOpts.CPlusPlus11 = Standard == FormatStyle::LS_Cpp03 ? 0 : 1;
-  LangOpts.CPlusPlus1y = Standard == FormatStyle::LS_Cpp03 ? 0 : 1;
+  LangOpts.CPlusPlus14 = Standard == FormatStyle::LS_Cpp03 ? 0 : 1;
   LangOpts.LineComment = 1;
   LangOpts.CXXOperatorNames = 1;
   LangOpts.Bool = 1;