Mac OS X X86-64 ABI is same as the standard.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41700 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86Subtarget.h b/lib/Target/X86/X86Subtarget.h
index 1b76d76..493c801 100644
--- a/lib/Target/X86/X86Subtarget.h
+++ b/lib/Target/X86/X86Subtarget.h
@@ -145,12 +145,8 @@
 
   std::string getDataLayout() const {
     const char *p;
-    if (is64Bit()) {
-      if (isTargetDarwin())
-        p = "e-p:64:64-f64:32:64-i64:32:64-f80:128:128";
-      else
-        p = "e-p:64:64-f64:64:64-i64:64:64-f80:128:128";
-    }
+    if (is64Bit())
+      p = "e-p:64:64-f64:64:64-i64:64:64-f80:128:128";
     else {
       if (isTargetDarwin())
         p = "e-p:32:32-f64:32:64-i64:32:64-f80:128:128";