Tweaks AdvanceBytecodeOffsetOrReturn so that the sequence of (cmp,beq)+
instructions is converted to (cmp, cmpne+, beq) saving an instruction
for every return bytecode. In reality this just saves a single
instruction.

Bug: v8:9771
Change-Id: I7cf2d5ae27ff5495808792aa4c953b97c2bb5b71
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1853246
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64232}