Also removes the --no-recompile-concurrent from the callstats.py script.

BUG=v8:7790

Change-Id: I7e652dd273fd12565e086fe579bdf5974a876d9c
Reviewed-on: https://chromium-review.googlesource.com/1202402Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55709}