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Using the `amrex::PolymorphicArenaAllocator`. Close #425 ### To Do - [x] specialize PC with `amrex::PolymorphicArenaAllocator` - [x] update tests / add a Python test based on the C++ AMReX example - [x] run tests on GPU - [x] update WarpX: BLAST-WarpX/warpx#6374 - [x] update ImpactX: BLAST-ImpactX/impactx#1210 - [x] specialize/build less PC combinations for BLAST codes (only polymorphic) -- save build time in pyAMReX ### Later On - [x] add a C++ example to AMReX tests AMReX-Codes/amrex#4380 @atmyers - [ ] update Sphinx docs (remove other specialized types instead... maybe wait for full-RT PC...)
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setArena, updatedefine()calls, etc.