Correctly find shared function info for debugging when compiling eagerly.

R=ulan@chromium.org
BUG=v8:3717
LOG=N

Review URL: https://codereview.chromium.org/758523004

Cr-Commit-Position: refs/heads/master@{#25486}

src/debug.cc

@@ -2121,7 +2121,10 @@ Object* Debug::FindSharedFunctionInfoInScript(Handle<Script> script,
   Heap* heap = isolate_->heap();
   while (!done) {
     { // Extra scope for iterator.
-      HeapIterator iterator(heap);
+      // If lazy compilation is off, we won't have duplicate shared function
+      // infos that need to be filtered.
+      HeapIterator iterator(heap, FLAG_lazy ? HeapIterator::kNoFiltering
+                                            : HeapIterator::kFilterUnreachable);
       for (HeapObject* obj = iterator.next();
            obj != NULL; obj = iterator.next()) {
         bool found_next_candidate = false;

test/mjsunit/regress/regress-3717.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-debug-as debug --no-lazy
+
+Debug = debug.Debug;
+var exception = null;
+var break_count = 0;
+
+function f() {
+  function g(p) {
+    return 1;
+  }
+  g(1);
+};
+
+function listener(event, exec_state, event_data, data) {
+  try {
+    if (event == Debug.DebugEvent.Break) break_count++;
+  } catch (e) {
+    exception = e;
+  }
+}
+
+Debug.setListener(listener);
+var bp = Debug.setBreakPoint(f, 2);
+f();
+Debug.clearBreakPoint(bp);
+Debug.setListener(null);
+
+assertEquals(1, break_count);
+assertNull(exception);