[compiler-rt] [scudo] Support no-preserve-all-regions mode (PR #85149)

[Christopher Ferris via llvm-commits]

https://github.com/cferris1000 commented:

Is there good coverage of the no preserve case?

I know you changed the config in primary_test.cpp, but I'm not sure how much coverage that will get.

https://github.com/llvm/llvm-project/pull/85149