This seems like a very specific flag which is rarely used. It not only
adds local overhead, but also requires an additional parameter at
{BuildGraphForWasmFunction}.
Thus this CL removes it completely. Interested parties can still measure
timing locally.

R=titzer@chromium.org

Bug: v8:9183
Change-Id: I5f152cdb9456d1001ed38722d44c71cf5ae44ae3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1631420Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61858}