Revert of Stop using deprecated hash_map in vtune-jit.cc. (patchset #1 id:1 of https://codereview.chromium.org/1924403002/ )

Reason for revert:
Breaks vtune-jit build, see https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20vtunejit/builds/10670

Original issue's description:
> Stop using deprecated hash_map in vtune-jit.cc.
>
> Fixes https://github.com/nodejs/node/issues/6422.

TBR=jochen@chromium.org,info@bnoordhuis.nl,ben@strongloop.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/1940693002
Cr-Commit-Position: refs/heads/master@{#35917}