move things out of sys into os and runtime

R=r
OCL=28569
CL=28573
diff --git a/test/fixedbugs/bug120.go b/test/fixedbugs/bug120.go
index 10e2803..06a07e8 100644
--- a/test/fixedbugs/bug120.go
+++ b/test/fixedbugs/bug120.go
@@ -6,6 +6,7 @@
 
 package main
 
+import "os"
 import "strconv";
 
 type Test struct {
@@ -53,6 +54,6 @@
 		}
 	}
 	if !ok {
-		sys.Exit(1);
+		os.Exit(1);
 	}
 }