This removes the macro in question form the utility header. In the long
run we want to convert all RUNTIME_ASSERTs to CHECKs, now that runtime
functions are no longer fuzzed directly. This is just a first step.

R=bmeurer@chromium.org
BUG=v8:5066

Review-Url: https://codereview.chromium.org/2038013002
Cr-Commit-Position: refs/heads/master@{#36735}