runtime: make go vet happy

CL 117950044 updates vet to fix LEA* issue.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/112440043

src/pkg/runtime/asm_amd64.s

@@ -2276,7 +2276,7 @@ TEXT runtime·gohash(SB), NOSPLIT, $24-40
 	MOVQ	size+16(FP), DX
 	MOVQ	seed+24(FP), DI
 	MOVQ	DI, ret+32(FP)
-	LEAQ	ret+32(FP), SI	// TODO: go vet complains here: "invalid LEAQ of ret+32(FP); bool is 1-byte value"
+	LEAQ	ret+32(FP), SI
 	MOVQ	SI, 0(SP)
 	MOVQ	DX, 8(SP)
 	MOVQ	CX, 16(SP)

src/pkg/runtime/asm_amd64p32.s

@@ -672,10 +672,10 @@ TEXT runtime·getcallerpc(SB),NOSPLIT,$0-8
 	MOVL	-8(AX),AX		// get calling pc
 	RET
 
-TEXT runtime·gogetcallerpc(SB),NOSPLIT,$0-8
+TEXT runtime·gogetcallerpc(SB),NOSPLIT,$0-12
 	MOVL	p+0(FP),AX		// addr of first arg
 	MOVL	-8(AX),AX		// get calling pc
-	MOVL	AX, ret+4(FP)
+	MOVL	AX, ret+8(FP)
 	RET
 
 TEXT runtime·setcallerpc(SB),NOSPLIT,$0-16