[clang] [compiler-rt] [PGO][HIP] HSA-introspection device profile drain + GPU PGO tests (PR #203056)

[Larry Meadows via cfe-commits]

lfmeadow wrote:

> > That's right. There are cases (such as RCCL) where the device code doesn't have a corresponding host shadow HIP module. HSA is used to introspect the device side modules and drain the counters.
> > Note that for linux, we don't even need the HIP path with this PR. Windows doesn't have HSA so we still need the HIP path there.
> 
> This seems like a huge mess of likely 100% AI generated code. Could we at least split this up? I see ifdefs on Win32, which wouldn't apply to the HSA case (as far as I know, I do think there was some work for HSA on Windows at some point).

I'll rewrite it by hand.

https://github.com/llvm/llvm-project/pull/203056