This makes sure that --hydrogen-filter only filters for Crankshaft, not
for TurboFan compilations. For TurboFan there is --turbo-filter as a
separate flag already. There no longer is a single flag to filter both
compilers at the same time, one can still specify both flags however.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1871343003

Cr-Commit-Position: refs/heads/master@{#35388}