[debugger] muting break positions should work for the entire statement.

test/mjsunit/debug-negative-break-points.js

Index: test/mjsunit/debug-negative-break-points.js
diff --git a/test/mjsunit/debug-negative-break-points.js b/test/mjsunit/debug-negative-break-points.js
index d2383c97b0ede2e0b1ee7f8291e3e0a873e03787..1eb8943a074f31d4103bde9c279b4711622c31dc 100644
--- a/test/mjsunit/debug-negative-break-points.js
+++ b/test/mjsunit/debug-negative-break-points.js
@@ -33,6 +33,14 @@ function g(x) {
   }
 }
 
+function h(x) {
+  var a = undefined;
+  try {
+    var x = a();
+  } catch (e) {
+  }
+}
+
 Debug.setListener(listener);
 
 assertCount(0, 0);
@@ -79,5 +87,13 @@ assertCount(8, 4);
 g(0);
 assertCount(8, 4);
 
+h(0);
+assertCount(8, 5);
+Debug.setBreakPoint(h, 3, 0, "x > 0");
+h(1);
+assertCount(9, 6);
+h(0);
+assertCount(9, 6);
+
 Debug.clearBreakOnException();
 Debug.setListener(null);