Add assembly.h for use in .S files.

llvm-svn: 85263
diff --git a/compiler-rt/lib/i386/floatdixf.S b/compiler-rt/lib/i386/floatdixf.S
index 71e2d2a..cd85c09 100644
--- a/compiler-rt/lib/i386/floatdixf.S
+++ b/compiler-rt/lib/i386/floatdixf.S
@@ -1,6 +1,8 @@
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 
+#include "../assembly.h"
+
 // float __floatdixf(di_int a);
 
 #ifdef __i386__