[compiler-rt] [llvm] [memprof] Use -memprof-default-options to set options during compile time (PR #118874)

[Snehasish Kumar via llvm-commits]

https://github.com/snehasish commented:

Downstream we override with own `__memprof_default_options` method. Can you add a test case to `/memprof/TestCases/default_options.cpp` which uses this option and ensures that the override approach takes precedence?

https://github.com/llvm/llvm-project/pull/118874