[interpreter, debugger] replace bytecode on-stack for debugging.

test/mjsunit/ignition/debug-break-on-stack.js

Index: test/mjsunit/ignition/debug-break-on-stack.js
diff --git a/test/mjsunit/ignition/debug-break.js b/test/mjsunit/ignition/debug-break-on-stack.js
similarity index 70%
copy from test/mjsunit/ignition/debug-break.js
copy to test/mjsunit/ignition/debug-break-on-stack.js
index 8237d4a55292a5f14e59c9d0a36ed86812e7fd09..d2577b38de85f4cc10a74afc3973bdb9d7fee79f 100644
--- a/test/mjsunit/ignition/debug-break.js
+++ b/test/mjsunit/ignition/debug-break-on-stack.js
@@ -14,33 +14,35 @@ function listener(event, exec_state, event_data, data) {
   try {
     break_count++;
     var line = exec_state.frame(0).sourceLineText();
+    print(line);
     assertTrue(line.indexOf(`B${break_count}`) > 0);
   } catch (e) {
     exception = e;
   }
 }
 
-Debug.setListener(listener);
 
 function g() {
-  throw 1;
+  setbreaks();
+  throw 1;  // B1
 }
 
 function f() {
   try {
-    g();                         // B1
+    g();
   } catch (e) {}
-  assertEquals(2, break_count);  // B2
-  return 1;                      // B3
+  return 2;  // B2
 }
 
-Debug.setBreakPoint(f, 2, 0);
-Debug.setBreakPoint(f, 4, 1);
-Debug.setBreakPoint(f, 5, 1);
+function setbreaks() {
+  Debug.setListener(listener);
+  Debug.setBreakPoint(g, 2, 0);
+  Debug.setBreakPoint(f, 4, 0);
+}
 
 f();
 
-assertEquals(3, break_count);
+assertEquals(2, break_count);
 assertNull(exception);
 
 Debug.setListener(null);