[PATCH] process the -fno-signed-zeros optimization flag (PR20870)

[Richard Smith]

================
Comment at: lib/Frontend/CompilerInvocation.cpp:429-430
@@ -428,3 +428,4 @@
                        Args.hasArg(OPT_cl_fast_relaxed_math));
-  Opts.NoSignedZeros = Args.hasArg(OPT_cl_no_signed_zeros);
+  Opts.NoSignedZeros = (Args.hasArg(OPT_cl_no_signed_zeros) ||
+                        Args.hasArg(OPT_fno_signed_zeros));
   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
----------------
We generally try to keep our `-cc1` interface simple and minimal. Can we remove the `OPT_cl_no_signed_zeros` option, and instead create `-fno-signed-zeros` in the CL case from the driver?

http://reviews.llvm.org/D6873

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