Frame inspection is currently limited to locations of execution.
Further details like local variables or stack content will follow later.

The FrameInspector now stores a pointer to the interpreted wasm frame,
and redirects certain requests there, just as for deoptimized frames.
Hitting breakpoints is now also supported for wasm frames.

R=yangguo@chromium.org, titzer@chromium.org
BUG=v8:5822

Review-Url: https://codereview.chromium.org/2629823003
Cr-Commit-Position: refs/heads/master@{#42551}