Store initial slots per size pool #8116
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This commit stores the initial slots per size pool, configured with the environment variables `RUBY_GC_HEAP_INIT_SIZE_%d_SLOTS`. This ensures that the configured initial slots remains a low bound for the number of slots in the heap, which can prevent heaps from thrashing in size.
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It's not guaranteed that the first element will always be embedded.
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Backports ruby/ruby#8116 (as commit Shopify/ruby@9711815).
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This commit stores the initial slots per size pool, configured with the environment variables
RUBY_GC_HEAP_INIT_SIZE_%d_SLOTS. This ensures that the configured initial slots remains a low bound for thenumber of slots in the heap, which can prevent heaps from thrashing in size.
cc. @byroot