Search for free memory ranges within the +/- 2GB boundary to the
embedded builtins. So that code range can be allocated close to the
binary to enable short builtin calls when pointer compression is
disabled.

Bug: v8:12045, v8:11527
Change-Id: I4698625882c3c7c39aff73b0bc874ddcfc990881
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3212466
Commit-Queue: Hao A Xu <hao.a.xu@intel.com>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77465}