fixed len/cap for chan. disable gc for now.

        go/test: passes 93% (323/345)

R=rsc
http://go/go-review/1015006
diff --git a/src/all-arm.bash b/src/all-arm.bash
index 81cba29..0bf9927 100755
--- a/src/all-arm.bash
+++ b/src/all-arm.bash
@@ -17,6 +17,10 @@
 	builtin cd $1
 }
 
+# temporarily turn GC off
+# TODO(kaib): reenable GC once everything else works
+export GOGC=off
+
 (xcd ../test
 ./run-arm
 ) || exit $?