RegisterFrameState is a container for free registers and values.
It abstracts operations for GeneralRegisters and DoubleRegisters.

It will be used later to call generic functions from the allocator,
depending on the register type needed.
See PrintLiveRegs as an example of function reuse.

Bug: v8:7700
Change-Id: If8e6cdb048c1782ca097d9bc2d810c66f680601a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3596127Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80121}