Make -m[no-]pascal-strings an alias of -f[no]pascal-strings in the .td file

This way we don't have to translate it manually in Clang::ConstructJob.

Differential Revision: http://llvm-reviews.chandlerc.com/D1249

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187547 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 7eccbb5..50630b6 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -3300,16 +3300,9 @@
   if (Arg *A = Args.getLastArg(options::OPT_fshort_wchar))
     A->render(Args, CmdArgs);
 
-  // -fno-pascal-strings is default, only pass non-default. If the tool chain
-  // happened to translate to -mpascal-strings, we want to back translate here.
-  //
-  // FIXME: This is gross; that translation should be pulled from the
-  // tool chain.
+  // -fno-pascal-strings is default, only pass non-default.
   if (Args.hasFlag(options::OPT_fpascal_strings,
                    options::OPT_fno_pascal_strings,
-                   false) ||
-      Args.hasFlag(options::OPT_mpascal_strings,
-                   options::OPT_mno_pascal_strings,
                    false))
     CmdArgs.push_back("-fpascal-strings");