runtime: remove cross-function jump in vlop_arm.s

The new linker will disallow this on arm
(it is already disallowed on amd64 and 386)
in order to be able to lay out each function
separately.

The restriction is only for jumps into the middle
of a function; jumps to the beginning of a function
remain fine.

Prereq for linker cleanup (golang.org/s/go13linker).

R=iant, r, minux.ma
CC=golang-dev
https://golang.org/cl/35800043

src/pkg/runtime/vlop_arm.s

@@ -255,7 +255,7 @@ TEXT _div(SB),NOSPLIT,$16
 d0:
 	BL  	udiv<>(SB)  		/* none/both neg */
 	MOVW	R(q), R(TMP)
-	B		out
+	B		out1
 d1:
 	CMP 	$0, R(q)
 	BGE 	d0
@@ -263,7 +263,12 @@ d1:
 d2:
 	BL  	udiv<>(SB)  		/* one neg */
 	RSB		$0, R(q), R(TMP)
-	B   	out
+out1:
+	MOVW	4(R13), R(q)
+	MOVW	8(R13), R(r)
+	MOVW	12(R13), R(s)
+	MOVW	16(R13), R(M)
+	RET
 
 TEXT _mod(SB),NOSPLIT,$16
 	MOVW	R(q), 4(R13)