A couple more darwinisms

llvm-svn: 22450
diff --git a/llvm/lib/Target/X86/X86AsmPrinter.cpp b/llvm/lib/Target/X86/X86AsmPrinter.cpp
index 17752b9..9a30bab 100644
--- a/llvm/lib/Target/X86/X86AsmPrinter.cpp
+++ b/llvm/lib/Target/X86/X86AsmPrinter.cpp
@@ -62,9 +62,12 @@
   if (leadingUnderscore || forCygwin || forDarwin)
     GlobalPrefix = "_";
 
-  if (forDarwin)
+  if (forDarwin) {
     AlignmentIsInBytes = false;
-
+    Data64bitsDirective = 0;       // we can't emit a 64-bit unit
+    ZeroDirective = "\t.space\t";  // ".space N" emits N zeros.
+  }
+  
   return AsmPrinter::doInitialization(M);
 }