[clang] [llvm] [PowerPC] Tune AIX shared library TLS model at function level by heuristic (PR #84132)

[Amy Kwan via cfe-commits]

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@@ -3369,6 +3369,59 @@ SDValue PPCTargetLowering::LowerGlobalTLSAddressAIX(SDValue Op,
   bool Is64Bit = Subtarget.isPPC64();
   bool HasAIXSmallLocalExecTLS = Subtarget.hasAIXSmallLocalExecTLS();
   TLSModel::Model Model = getTargetMachine().getTLSModel(GV);
+  // Initialize TLS model opt setting lazily:
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amy-kwan wrote:

This primarily sets the TLS model per function. Not sure if it is possible, but can it/does it make sense for this part to be separated into its own function?

https://github.com/llvm/llvm-project/pull/84132