Port ae03752f

Original Commit Message:

    This implements inspection of live registers on breakpoints in Liftoff.
    To that end, the frame pointer of the WasmDebugBreak frame is remembered
    when iterating the stack. Based on a platform-specific implementation of
    {WasmDebugBreakFrameConstants}, the offset of the respective register
    within that frame is computed, and the value is read from the frame.

    As a drive-by, the wasm debug side table is storing register codes as
    liftoff codes, which can also store register pairs (needed for i64 on
    32-bit platforms, and for SIMD, which is not supported yet).

R=clemensb@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I1f4a52c349bd57098f633c5fd641642695b6fe96
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2106294Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#66737}