gc: fix arm build

Escape analysis was incorrectly assuming that
functions without bodies don't leak their
parameters.  This meant that sync/atomic's
TestAddInt64 was allocating x on its stack,
and then x was not properly aligned for use
with the atomic 64-bit instructions.  Obviously
we should figure out the alignment story on 5g
too, but this fix is correct and should restore the
build to 'ok'.

TBR=lvd
CC=golang-dev
http://codereview.appspot.com/4964047

1 files changed, 6 insertions, 0 deletions

diff --git a/test/escape2.go b/test/escape2.go
index 24a88f751..0b78624b6 100644
--- a/test/escape2.go
+++ b/test/escape2.go
@@ -774,3 +774,9 @@ func foo118(unknown func(*int)) {  // ERROR "unknown does not escape"
 	x := 1 // ERROR "moved to heap: NAME-x"
 	unknown(&x) // ERROR "&x escapes to heap"
 }
+
+func external(*int)
+
+func foo119(x *int) {  // ERROR "leaking param: NAME-x"
+	external(x)
+}