The check in question will trigger because one of our unit tests still
emits the bytecode (i.e. unittests/BytecodeArrayBuilderTest) even when
the flag is turned on by default.

R=rmcilroy@chromium.org
TEST=unittests/BytecodeArrayBuilderTest.AllBytecodesGenerated

Review URL: https://codereview.chromium.org/1820753003

Cr-Commit-Position: refs/heads/master@{#34954}