The code generated for the TestTypeOf bytecode was not ideal, mostly
because of the default case that just aborted. If we do CSA_ASSERT to
check the validity of the literal_flag instead anf then just use the
last label as the default, the bytecode handler no longer builds a
stack frame and generated code quality is now really close to ideal.

The TestTypeOf bytecode handler was found to be among the three
hottest bytecode handlers in the Speedometer/AngularJS benchmark.

R=jarin@chromium.org

Change-Id: I47705a0ca0a436d5c42899001064e77d44845a64
Reviewed-on: https://chromium-review.googlesource.com/589207Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46930}