This changes the existing --print-wasm-code to no longer print code for
runtime stubs (or any other stub code). The new --print-wasm-stub-code
can be used to specifically print such stubs. This does not affect the
existing --print-code behavior.

R=ahaas@chromium.org

Change-Id: I7a00722bf6e7cfbc210245cfd00dac16905f8902
Reviewed-on: https://chromium-review.googlesource.com/c/1411883Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58857}