[compiler-rt] [compiler-rt] Fix #122795 for solaris platforms proposal. (PR #122956)

[Rainer Orth via llvm-commits]

rorth wrote:

> LGTM from sanitizer perspective but let's wait for Solaris reply as well

I've now successfully tested the patch on both `amd64-pc-solaris2.11` and `sparcv9-sun-solaris2.11`.

https://github.com/llvm/llvm-project/pull/122956