[interpreter] Change interpreter to use an BytecodeArray pointer and and offset.

[interpreter] Change interpreter to use an BytecodeArray pointer and and offset.

Changes the interpreter to use a BytecodeArray pointer and an offset to avoid
having an inner pointer to a BytecodeArray object in registers during dispatch.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1254293006

Cr-Commit-Position: refs/heads/master@{#29910}