[compiler-rt] [SPARC][builtins] Add sparcv9 arch name for 32-bit SPARC (PR #170133)

[Rainer Orth via llvm-commits]

rorth wrote:

> > even the loss of builtins testing has been completely ignored so far
> 
> #166837

Finally :-)  That's great news, I'll give the patch a try myself.

https://github.com/llvm/llvm-project/pull/170133