Debugger: use debug break slot to break on call.

test/mjsunit/debug-stepframe-clearing.js

Index: test/mjsunit/debug-stepframe-clearing.js
diff --git a/test/mjsunit/debug-stepframe-clearing.js b/test/mjsunit/debug-stepframe-clearing.js
index c440e78dd2d296ef42c909468aa6eaff66837db6..a0774ccee272b33366db3fd63af65605504ea5d8 100644
--- a/test/mjsunit/debug-stepframe-clearing.js
+++ b/test/mjsunit/debug-stepframe-clearing.js
@@ -17,7 +17,7 @@ function f1() {
     }                               // Line 6
     print("break here");            // Break 3
   }                                 // Line 8
-  print("exiting f1");              // Line 9 (dummy break)
+  print("exiting f1");              // Break 4
 }
 
 function get() {
@@ -61,7 +61,7 @@ function listener(event, exec_state, event_data, data) {
       exec_state.prepareStep(Debug.StepAction.StepFrame, 1);
     } else {
       assertEquals(4, break_count);
-      assertEquals(2, match_value);
+      assertEquals(4, match_value);
       // Apparently we can still stop in the accessor even though we cleared
       // breakpoints earlier and there was a monomorphic step.
       // Allow running to completion now.