MIPS: [turbofan] Optimize certain chains of Branch into a Switch.

MIPS: [turbofan] Optimize certain chains of Branch into a Switch.

Port acd9c46ca7a0ada723d717f2545fd484c824eaa2

Original commit message:
This adds a new ControlFlowOptimizer that - for now - recognizes chains
of Branches generated by the SwitchBuilder for a subset of javascript
switches into Switch nodes. Those Switch nodes are then lowered to
either table or lookup switches.

Also rename Case to IfValue (and introduce IfDefault) for consistency.

BUG=v8:3872
LOG=n

Review URL: https://codereview.chromium.org/931263002

Cr-Commit-Position: refs/heads/master@{#26707}