Add GCHeapMallocator - #11084
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needs an issue fix, or changelog entry. Otherwise looks good.
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Review:Needs Changelog
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Adds
GCHeapMallocator, an explicitly managed allocator backed by the GC heap. It preserves the currentGCAllocatormanual allocation, reallocation, and deallocation behavior under a distinct name, preparing for a later change that makesGCAllocatorautomatically reclaimed only.Also adds focused allocator tests and documents the new type in the building-block catalogue.
Tests:
make std/experimental/allocator/gc_allocator.testmake std/experimental/allocator/building_blocks.testmake std/experimental/allocator/gc_allocator.publictestsmake unittest