MIPS: [turbofan] Initial support for Switch.
MIPS: [turbofan] Initial support for Switch.

Port feb2890711e8072a9550abb89621929816fc9699

Original commit message:
Adds Switch and Case operators to TurboFan and handles them
appropriately in instruction selection and code generation.

BUG=

Review URL: https://codereview.chromium.org/896973005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#26535}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh