[debug] Collect source positions Debug::PrintBreakLocation

Force source position collection when using --print-break-location.

Bug: v8:10132
Change-Id: I4706d9f1e09c52ca7bfb2410485bc3ef26c2128a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2011821
Auto-Submit: Dan Elphick <delphick@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65885}

src/debug/debug.cc

@@ -2051,6 +2051,7 @@ void Debug::PrintBreakLocation() {
   if (iterator.done()) return;
   StandardFrame* frame = iterator.frame();
   FrameSummary summary = FrameSummary::GetTop(frame);
+  summary.EnsureSourcePositionsAvailable();
   int source_position = summary.SourcePosition();
   Handle<Object> script_obj = summary.script();
   PrintF("[debug] break in function '");

test/debugger/regress/regress-crbug-10132.js

+// Copyright 2020 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: --print-break-location
+
+// Ensure that --print-break-location correctly collects source positions on
+// breaking.
+debug.Debug
+debugger;