[PATCH] D102783: [scudo] Separate Fuchsia & Default SizeClassMap

[Kostya Kortchinsky via Phabricator via llvm-commits]

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The Fuchsia allocator config was using the default size class map.

This CL gives Fuchsia its own size class map and changes a couple of
things in the default one:

- make `SizeDelta` configurable in `Config` for a fixed size class map as it currently is for a table size class map;
- switch `SizeDelta` to 0 for the default config, it allows for size classes that allow for power of 2s, and overall better wrt pages filling;
- increase the max number of caches pointers to 14 in the default, this makes the transfer batch 64/128 bytes on 32/64-bit platforms, which is cache-line friendly (previous size was 48/96 bytes).

The Fuchsia size class map remains untouched for now, this doesn't
impact Android which uses the table size class map.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D102783

Files:
  compiler-rt/lib/scudo/standalone/allocator_config.h
  compiler-rt/lib/scudo/standalone/size_class_map.h
  compiler-rt/lib/scudo/standalone/tests/combined_test.cpp
  compiler-rt/lib/scudo/standalone/tests/size_class_map_test.cpp

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