[clang] [compiler-rt] [compiler-rt] adding safestack support for sunos platforms. (PR #95648)

[Rainer Orth via cfe-commits]

rorth wrote:

This patch broke the [Solaris/amd64](https://lab.llvm.org/staging/#/builders/94/builds/4729) buildbot.

For god's sake, can you please either test your Illumos patches on Solaris, too (there are Solaris buildbots in the cfarm for exactly such a purpose) and finally handle Issue #53919 when it's necessary to distinguish Solaris and Illumos.

This happens ever and ever again with your patches and I'm getting pissed off by this attitude!

https://github.com/llvm/llvm-project/pull/95648