fix build

R=ken2
CC=golang-dev
https://golang.org/cl/2621042

src/pkg/debug/gosym/pclinetest.s

@@ -51,37 +51,8 @@ TEXT main(SB),7,$0
 	CALL pcfromline(SB)
 
 // Keep the linker happy
-TEXT runtime·morestack(SB),7,$0
+TEXT main·main(SB),7,$0
 	RET
 
-TEXT runtime·morestack00(SB),7,$0
+TEXT main·init(SB),7,$0
 	RET
-
-TEXT runtime·morestack10(SB),7,$0
-	RET
-
-TEXT runtime·morestack01(SB),7,$0
-	RET
-
-TEXT runtime·morestack11(SB),7,$0
-	RET
-
-TEXT runtime·morestack8(SB),7,$0
-	RET
-
-TEXT runtime·morestack16(SB),7,$0
-	RET
-
-TEXT runtime·morestack24(SB),7,$0
-	RET
-
-TEXT runtime·morestack32(SB),7,$0
-	RET
-
-TEXT runtime·morestack40(SB),7,$0
-	RET
-
-TEXT runtime·morestack48(SB),7,$0
-	RET
-
-