Recognize -mno-implicit-float option for x86 as well as ARM. <rdar://13180731>

For x86 targets, we've been using the -msoft-float option to control passing
the no-implicit-float option to cc1. Since the -mno-implicit-float option is
now accepted by the driver, this just makes it work for x86 the same as it
does for ARM targets.

llvm-svn: 174836
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 77c7d22..c5499de 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1202,7 +1202,8 @@
 
   if (Args.hasFlag(options::OPT_msoft_float,
                    options::OPT_mno_soft_float,
-                   false))
+                   false) ||
+      Args.hasArg(options::OPT_mno_implicit_float))
     CmdArgs.push_back("-no-implicit-float");
 
   if (const char *CPUName = getX86TargetCPU(Args, getToolChain().getTriple())) {