Add amrex::Gpu::streamFree #4804
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Summary
This PR adds the function
amrex::Gpu::streamFree (Arena* arena, void* mem)that can be used to free memory the next time the current GPU stream is synchronized.This is based on #4432 but with much reduced complexity from OMP.
The interface is now opt-in and always available, instead of needing to be enabled using runtime parameters.
Additional background
Checklist
The proposed changes: