Port 9c7b6e1e

Original Commit Message:

    This is the implementation of crrev.com/c/766371 for arm.

    Original description:

    Add the ability to return (multiple) return values on the stack:

    - Extend stack frames with a new buffer region for return slots.
      This region is located at the end of a caller's frame such that
      its slots can be indexed as caller frame slots in a callee
      (located beyond its parameters) and assigned return values.
    - Adjust stack frame constructon and deconstruction accordingly.
    - Extend linkage computation to support register plus stack returns.
    - Reserve return slots in caller frame when respective calls occur.
    - Introduce and generate architecture instructions ('peek') for
      reading back results from return slots in the caller.
    - Aggressive tests.
    - Some minor clean-up.

R=ahaas@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, miladfar@ca.ibm.com
BUG=
LOG=N

Change-Id: I83df1af8c49f6d6c5b529db599fce61a1da2490d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1496549Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#60032}