Fix ub in binutils causing failure to build for arm with clang

https://sourceware.org/bugzilla/show_bug.cgi?id=19222

Fixed by applying binutils@d840c08.

patches/binutils-2.25.1/0007-tcarm.diff

@@ -0,0 +1,21 @@
+From d840c081f8082e8b9e63fead5306643975a97bb3 Mon Sep 17 00:00:00 2001
+From: Richard Earnshaw <[email protected]>
+Date: Thu, 20 Nov 2014 17:02:47 +0000
+Subject: [PATCH] * config/tc-arm.c (rotate_left): Avoid undefined behaviour
+ when N = 0.
+
+---
+
+diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
+index 5077f87..9100fb2 100644
+--- a/gas/config/tc-arm.c
++++ b/gas/config/tc-arm.c
+@@ -7251,7 +7251,7 @@ parse_operands (char *str, const unsigned int *pattern, bfd_boolean thumb)
+ 
+ /* Functions for operand encoding.  ARM, then Thumb.  */
+ 
+-#define rotate_left(v, n) (v << n | v >> (32 - n))
++#define rotate_left(v, n) (v << (n & 31) | v >> ((32 - n) & 31))
+ 
+ /* If VAL can be encoded in the immediate field of an ARM instruction,
+    return the encoded form.  Otherwise, return FAIL.  */