base: Eliminate pinned allocations from IntTable
This replaces the ForeignPtr used to track IntTable's pointer size with a single-entry mutable ByteArray#, eliminating the fragmentation noted in #19171 (closed).
Fixes #19171 (closed).
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This replaces the ForeignPtr used to track IntTable's pointer size with a single-entry mutable ByteArray#, eliminating the fragmentation noted in #19171 (closed).
Fixes #19171 (closed).