[clang] [clang][AIX] Handle triple environment component for per target runtime directory (PR #140850)

[Jake Egan via cfe-commits]

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@@ -935,6 +935,14 @@ ToolChain::getTargetSubDirPath(StringRef BaseDir) const {
   if (auto Path = getPathForTriple(T))
     return *Path;
 
+  // On AIX, the environment component is not used in the target sub dir name.
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jakeegan wrote:

Actually, getRuntimePath already calls getTripleWithoutOSVersion for AIX, but it doesn't strip -unknown, so it creates a path like lib/powerpc-ibm-aix-unknown

https://github.com/llvm/llvm-project/pull/140850