[compiler-rt] [memprof] Add flag to control profile dump at exit (PR #119452)

[Ellis Hoag via llvm-commits]

ellishg wrote:

> Can you describe the scenario where this is useful?

If we manually call `__memprof_profile_dump()`, we don't want a second profile to be automatically dumped when the program exits.

https://github.com/llvm/llvm-project/pull/119452