Port 84f8a506

Original commit message:
    Adds a ForInPrepare Runtime function which returns a triple of
    cache_type, cache_array and cache_length.

    This requires adding support to CEntryStub to call runtime functions
    which return a ObjectTriple - a struct containing three Object*
    pointers. Also did some cleanup of the x64 CEntryStub to avoid
    replicated code.

    Replaces the interpreter's use of the ad-hock InterpreterForInPrepare
    Runtime function with ForInPrepare in preparation for fixing deopt in
    BytecodeGraphBuilder for ForIn (which will be done in a followup CL).

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1586153004

Cr-Commit-Position: refs/heads/master@{#33342}