Revert "[Driver] Make sure -fno-math-builtin option is being passed by the driver."

This reverts commit r258814.

llvm-svn: 258815
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index a533192..faec8a1 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -5465,13 +5465,12 @@
                    options::OPT_fno_apple_pragma_pack, false))
     CmdArgs.push_back("-fapple-pragma-pack");
 
-  // Process -fno-math-builtin options.
   // le32-specific flags:
   //  -fno-math-builtin: clang should not convert math builtins to intrinsics
   //                     by default.
-  if (Args.hasArg(options::OPT_fno_math_builtin) ||
-      getToolChain().getArch() == llvm::Triple::le32)
+  if (getToolChain().getArch() == llvm::Triple::le32) {
     CmdArgs.push_back("-fno-math-builtin");
+  }
 
 // Default to -fno-builtin-str{cat,cpy} on Darwin for ARM.
 //