[ARM] Fix NEON wrongly being enabled with soft-float when targeting armv8/Cortex-A53/A57.

This was caused by r200708 which enabled the crypto feature for these cores.

llvm-svn: 201223
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 5087ce6..9e71c31 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -718,8 +718,11 @@
 
   // Setting -msoft-float effectively disables NEON because of the GCC
   // implementation, although the same isn't true of VFP or VFP3.
-  if (FloatABI == "soft")
+  if (FloatABI == "soft") {
     Features.push_back("-neon");
+    // Also need to explicitly disable features which imply NEON.
+    Features.push_back("-crypto");
+  }
 
   // En/disable crc
   if (Arg *A = Args.getLastArg(options::OPT_mcrc,