gc: test + fix escape analysis bug

R=lvd
CC=golang-dev
https://golang.org/cl/5333049

src/cmd/gc/esc.c

@@ -239,6 +239,7 @@ esc(Node *n)
 	case OPROC:
 		// go f(x) - f and x escape
 		escassign(&theSink, n->left->left);
+		escassign(&theSink, n->left->right);  // ODDDARG for call
 		for(ll=n->left->list; ll; ll=ll->next)
 			escassign(&theSink, ll->n);
 		break;

test/escape2.go

@@ -6,7 +6,10 @@
 
 package foo
 
-import "unsafe"
+import (
+	"fmt"
+	"unsafe"
+)
 
 var gxx *int
 
@@ -993,3 +996,18 @@ L100:
 	goto L99
 	goto L100
 }
+
+func foo121() {
+	for i := 0; i < 10; i++ {
+		defer myprint(nil, i) // ERROR "[.][.][.] argument escapes to heap"
+		go myprint(nil, i)    // ERROR "[.][.][.] argument escapes to heap"
+	}
+}
+
+// same as foo121 but check across import
+func foo121b() {
+	for i := 0; i < 10; i++ {
+		defer fmt.Printf("%d", i) // ERROR "[.][.][.] argument escapes to heap"
+		go fmt.Printf("%d", i)    // ERROR "[.][.][.] argument escapes to heap"
+	}
+}