[clang] [PowerPC] Support mcmodel=large for AIX (PR #70652)

[Chen Zheng via cfe-commits]

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@@ -5723,7 +5723,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   if (Arg *A = Args.getLastArg(options::OPT_mcmodel_EQ)) {
     StringRef CM = A->getValue();
     bool Ok = false;
-    if (Triple.isOSAIX() && CM == "medium") {
+    if (Triple.isOSAIX() && (CM == "medium" || CM == "large")) {
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chenzheng1030 wrote:

I think `-mcmodel=small` will cause same error?

https://github.com/llvm/llvm-project/pull/70652