ARM: enable the integrated assembler by default for Darwin.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151288 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.h b/lib/Driver/ToolChains.h
index 98c226b..0fb2138 100644
--- a/lib/Driver/ToolChains.h
+++ b/lib/Driver/ToolChains.h
@@ -329,9 +329,8 @@
 #ifdef DISABLE_DEFAULT_INTEGRATED_ASSEMBLER
     return false;
 #else
-    // Default integrated assembler to on for x86.
-    return (getTriple().getArch() == llvm::Triple::x86 ||
-            getTriple().getArch() == llvm::Triple::x86_64);
+    // Default integrated assembler to on for Darwin.
+    return true;
 #endif
   }
   virtual bool IsStrictAliasingDefault() const {