[ARM] Fix GCC3.3 build error

GCC 3.3 complains that r2 overlaps input operands when a u64 pointer
is passed into __put_user().  Fix this by using ip as a temporary
register instead.

arch/arm/lib/putuser.S

@@ -31,11 +31,11 @@
 
 	.global	__put_user_1
 __put_user_1:
-	bic	r2, sp, #0x1f00
-	bic	r2, r2, #0x00ff
-	ldr	r2, [r2, #TI_ADDR_LIMIT]
-	sub	r2, r2, #1
-	cmp	r0, r2
+	bic	ip, sp, #0x1f00
+	bic	ip, ip, #0x00ff
+	ldr	ip, [ip, #TI_ADDR_LIMIT]
+	sub	ip, ip, #1
+	cmp	r0, ip
 1:	strlsbt	r1, [r0]
 	movls	r0, #0
 	movls	pc, lr
@@ -43,17 +43,17 @@ __put_user_1:
 
 	.global	__put_user_2
 __put_user_2:
-	bic	r2, sp, #0x1f00
-	bic	r2, r2, #0x00ff
-	ldr	r2, [r2, #TI_ADDR_LIMIT]
-	sub	r2, r2, #2
-	cmp	r0, r2
-	movls	r2, r1, lsr #8
+	bic	ip, sp, #0x1f00
+	bic	ip, ip, #0x00ff
+	ldr	ip, [ip, #TI_ADDR_LIMIT]
+	sub	ip, ip, #2
+	cmp	r0, ip
+	movls	ip, r1, lsr #8
 #ifndef __ARMEB__
 2:	strlsbt	r1, [r0], #1
-3:	strlsbt	r2, [r0]
+3:	strlsbt	ip, [r0]
 #else
-2:	strlsbt	r2, [r0], #1
+2:	strlsbt	ip, [r0], #1
 3:	strlsbt	r1, [r0]
 #endif
 	movls	r0, #0
@@ -62,11 +62,11 @@ __put_user_2:
 
 	.global	__put_user_4
 __put_user_4:
-	bic	r2, sp, #0x1f00
-	bic	r2, r2, #0x00ff
-	ldr	r2, [r2, #TI_ADDR_LIMIT]
-	sub	r2, r2, #4
-	cmp	r0, r2
+	bic	ip, sp, #0x1f00
+	bic	ip, ip, #0x00ff
+	ldr	ip, [ip, #TI_ADDR_LIMIT]
+	sub	ip, ip, #4
+	cmp	r0, ip
 4:	strlst	r1, [r0]
 	movls	r0, #0
 	movls	pc, lr

include/asm-arm/uaccess.h

@@ -144,13 +144,13 @@ extern int __put_user_bad(void);
 		register int __e asm("r0");				\
 		switch (sizeof(*(__p))) {				\
 		case 1:							\
-			__put_user_x(__r1, __p, __e, 1, "r2", "lr");	\
+			__put_user_x(__r1, __p, __e, 1, "ip", "lr");	\
 			break;						\
 		case 2:							\
-			__put_user_x(__r1, __p, __e, 2, "r2", "lr");	\
+			__put_user_x(__r1, __p, __e, 2, "ip", "lr");	\
 			break;						\
 		case 4:							\
-			__put_user_x(__r1, __p, __e, 4, "r2", "lr");	\
+			__put_user_x(__r1, __p, __e, 4, "ip", "lr");	\
 			break;						\
 		case 8:							\
 			__put_user_x(__r1, __p, __e, 8, "ip", "lr");	\