[PATCH, AArch64]: Fix register allocation in strchrnul.S

[Richard Earnshaw]

Ooop!  I accidentally used a callee-saved register in the implementation
of strchrnul for AArch64.  Fortunately, the fix is trivial:

2014-12-10  Richard Earnshaw  <rearnsha@arm.com>

	* libc/machine/aarch64/strchrnul.S (vrepmask): Use a call-clobbered
	register.

Committed.

R.
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Index: strchrnul.S
===================================================================
RCS file: /cvs/src/src/newlib/libc/machine/aarch64/strchrnul.S,v
retrieving revision 1.1
diff -u -p -r1.1 strchrnul.S
--- strchrnul.S	11 Jun 2014 10:42:54 -0000	1.1
+++ strchrnul.S	10 Dec 2014 09:21:54 -0000
@@ -55,7 +55,7 @@
 #define vhas_nul2	v4
 #define vhas_chr1	v5
 #define vhas_chr2	v6
-#define vrepmask	v15
+#define vrepmask	v7
 #define vend1		v16
 
 /* Core algorithm.