Revert r160052, "Default to -std=c++11 on Windows.", for now.

Failing Tests (3):
    Clang :: Index/complete-cxx-inline-methods.cpp
    Clang :: Index/recursive-cxx-member-calls.cpp
    Clang :: SemaTemplate/inject-templated-friend-post.cpp

llvm-svn: 160103

clang/lib/Driver/Tools.cpp

@@ -2126,9 +2126,6 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     if (!types::isCXX(InputType))
         Args.AddAllArgsTranslated(CmdArgs, options::OPT_std_default_EQ,
                                   "-std=", /*Joined=*/true);
-    else if (getToolChain().getTriple().getOS() == llvm::Triple::Win32)
-      CmdArgs.push_back("-std=c++11");
-
     Args.AddLastArg(CmdArgs, options::OPT_trigraphs);
   }