This function is defined in feb28907.
   (https://codereview.chromium.org/892513003).

   original commit message:
    [turbofan] Initial support for Switch.

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

BUG=

Review URL: https://codereview.chromium.org/902943005

Cr-Commit-Position: refs/heads/master@{#26533}