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Fix `vmem_chunked` asymmetric allocation bug - #583

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ariscript wants to merge 3 commits into

ariscript:arprakas/chunked-symmetric-allocation-fix

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Fix `vmem_chunked` asymmetric allocation bug#583
ariscript wants to merge 3 commits into
ROCm:mainfrom
ariscript:arprakas/chunked-symmetric-allocation-fix

Commits on Oct 12, 2026
- Keep vmem_chunked heap offsets symmetric when ranks GC at different times
  
  ariscript
  and
  claude
  committed
  58ee4f8
Commits on Oct 13, 2026
- Return freed blocks at the top of the heap to the bump pointer
  
  ariscript
  and
  claude
  committed
  1965d08
- Reconcile frees after handing out 1/8 of the mapped heap
  
  ariscript
  and
  claude
  committed
  cba75a5