liblink, sync/atomic: fix arm build

The liblink code to insert the FUNCDATA for a stack map
from the Go prototype was not correct for ARM
(different data structure layout).

Also, sync/atomic was missing some Go prototypes
for ARM-specific functions.

TBR=r
CC=golang-codereviews
https://codereview.appspot.com/143160045

1 files changed, 1 insertions, 0 deletions

diff --git a/include/link.h b/include/link.h
index 8c73eab51..292b07739 100644
--- a/include/link.h
+++ b/include/link.h
@@ -471,6 +471,7 @@ struct LinkArch
 	int	D_PARAM;
 	int	D_SCONST;
 	int	D_STATIC;
+	int	D_OREG;
 
 	int	ACALL;
 	int	ADATA;