runtime: fix conflict resolution in golang.org/cl/14207

Fixes testshared on arm64 and ppc64le.

Change-Id: Ie94bc0c85c7666fbb5ab6fc6d3dbb180407a9955
Reviewed-on: https://go-review.googlesource.com/17212Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/runtime/asm_arm64.s

@@ -996,6 +996,7 @@ TEXT runtime·addmoduledata(SB),NOSPLIT,$0-0
 	MOVD	R0, runtime·lastmoduledatap(SB)
 	MOVD	8(RSP), R27
 	ADD	$0x10, RSP
+	RET
 
 TEXT ·checkASM(SB),NOSPLIT,$0-1
 	MOVW	$1, R3

src/runtime/asm_ppc64x.s

@@ -1079,6 +1079,7 @@ TEXT runtime·addmoduledata(SB),NOSPLIT|NOFRAME,$0-0
 	MOVD	R3, runtime·lastmoduledatap(SB)
 	MOVD	0(R1), R31
 	ADD	$8, R1
+	RET
 
 TEXT ·checkASM(SB),NOSPLIT,$0-1
 	MOVW	$1, R3