This prints the mnemonic of the bytecode that a bytecode handler belongs
to, whenever the handler is disassembled (not just during tracing). This
can be helpful when debugging code in GDB or with the snapshot where the
tracing is not available.

R=rmcilroy@chromium.org

Review URL: https://codereview.chromium.org/1806883002

Cr-Commit-Position: refs/heads/master@{#34826}