1) don't print off-heap TypedArray elements with --mock-arraybuffer-allocator
2) print integer HeapNumbers with max precision

Bug: v8:4153
Change-Id: I4ae00b5044e3a9b2dd641aba0e06496042d6ff76
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1875095Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64520}