[clang] [Driver] Enable ASan on Solaris/SPARC (PR #107403)

[Rainer Orth via cfe-commits]

rorth wrote:

> Curios, why Asan when there is Sparc ADI?

Various reasons:
- Because I can, and `gcc` already does ;-)
- Symmetry with other targets.
- ADI is 64-bit only, while ASan could support both 32 and 64-bit (currently only the former, though).
- ADI toolchain support is quite mixed right now.  E.g. the GDB ADI support (though done by Oracle employees) is Linux/sparc64-only.

https://github.com/llvm/llvm-project/pull/107403