runtime/internal/atomic: fix vet warnings

Change-Id: Ib29cf7abbbdaed81e918e5e41bca4e9b8da24621
Reviewed-on: https://go-review.googlesource.com/22503Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/runtime/internal/atomic/asm_mips64x.s

@@ -83,7 +83,7 @@ TEXT ·Xadduintptr(SB), NOSPLIT, $0-24
 TEXT ·Loadint64(SB), NOSPLIT, $0-16
 	JMP	·Load64(SB)
 
-TEXT ·Xaddint64(SB), NOSPLIT, $0-16
+TEXT ·Xaddint64(SB), NOSPLIT, $0-24
 	JMP	·Xadd64(SB)
 
 // bool casp(void **val, void *old, void *new)

src/runtime/internal/atomic/atomic_mips64x.s

@@ -8,27 +8,27 @@
 
 #define SYNC	WORD $0xf
 
-// uint32 runtime∕internal∕atomic·Load(uint32 volatile* addr)
+// uint32 runtime∕internal∕atomic·Load(uint32 volatile* ptr)
 TEXT ·Load(SB),NOSPLIT,$-8-12
-	MOVV	addr+0(FP), R1
+	MOVV	ptr+0(FP), R1
 	SYNC
 	MOVWU	0(R1), R1
 	SYNC
 	MOVW	R1, ret+8(FP)
 	RET
 
-// uint64 runtime∕internal∕atomic·Load64(uint64 volatile* addr)
+// uint64 runtime∕internal∕atomic·Load64(uint64 volatile* ptr)
 TEXT ·Load64(SB),NOSPLIT,$-8-16
-	MOVV	addr+0(FP), R1
+	MOVV	ptr+0(FP), R1
 	SYNC
 	MOVV	0(R1), R1
 	SYNC
 	MOVV	R1, ret+8(FP)
 	RET
 
-// void *runtime∕internal∕atomic·Loadp(void *volatile *addr)
+// void *runtime∕internal∕atomic·Loadp(void *volatile *ptr)
 TEXT ·Loadp(SB),NOSPLIT,$-8-16
-	MOVV	addr+0(FP), R1
+	MOVV	ptr+0(FP), R1
 	SYNC
 	MOVV	0(R1), R1
 	SYNC