[PS4] Set our default dialect to C++11. NFC for other targets.

Reapplies r296209 now that r296549 has fixed what really seems to be
the last problematic test.

llvm-svn: 296554

clang/lib/Frontend/CompilerInvocation.cpp

@@ -1582,6 +1582,10 @@ void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
     case IK_PreprocessedCXX:
     case IK_ObjCXX:
     case IK_PreprocessedObjCXX:
+      // The PS4 uses C++11 as the default C++ standard.
+      if (T.isPS4())
+        LangStd = LangStandard::lang_gnucxx11;
+      else
         LangStd = LangStandard::lang_gnucxx98;
       break;
     case IK_RenderScript: