syscall: fix nacl builds

Please see golang.org/cl/2588 for reasons behind the name change.
We also need NO_LOCAL_POINTERS for assembly function with non-zero
local frame size.

Change-Id: Iac60aa7e76f4c2ece3726e28878fd539bfebf7a4
Reviewed-on: https://go-review.googlesource.com/2589Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/syscall/asm_nacl_386.s

@@ -16,7 +16,8 @@
 #define NACL_SYSJMP(code) \
 	MOVL $(0x10000 + ((code)<<5)), AX; JMP AX
 
-TEXT syscall·Syscall(SB),NOSPLIT,$12-28
+TEXT ·Syscall(SB),NOSPLIT,$12-28
+	NO_LOCAL_POINTERS
 	CALL	runtime·entersyscall(SB)
 	MOVL	trap+0(FP), AX
 	MOVL	a1+4(FP), BX

src/syscall/asm_nacl_amd64p32.s

@@ -16,7 +16,7 @@
 #define NACL_SYSJMP(code) \
 	MOVL $(0x10000 + ((code)<<5)), AX; JMP AX
 
-TEXT syscall·Syscall(SB),NOSPLIT,$0-28
+TEXT ·Syscall(SB),NOSPLIT,$0-28
 	CALL	runtime·entersyscall(SB)
 	MOVL	trap+0(FP), AX
 	MOVL	a1+4(FP), DI

src/syscall/asm_nacl_arm.s

@@ -16,7 +16,7 @@
 #define NACL_SYSJMP(code) \
 	MOVW $(0x10000 + ((code)<<5)), R8; B (R8)
 
-TEXT syscall·Syscall(SB),NOSPLIT,$0-28
+TEXT ·Syscall(SB),NOSPLIT,$0-28
 	BL	runtime·entersyscall(SB)
 	MOVW	trap+0(FP), R8
 	MOVW	a1+4(FP), R0