[llvm] [clang] [PowerPC] Support local-dynamic TLS relocation on AIX (PR #66316)

[Amy Kwan via cfe-commits]

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@@ -2385,6 +2385,13 @@ MCSection *TargetLoweringObjectFileXCOFF::getSectionForExternalReference(
   SmallString<128> Name;
   getNameWithPrefix(Name, GO, TM);
 
+  // AIX TLS local-dynamic requires the setting for the specific symbol name.
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amy-kwan wrote:

Maybe we can clarify a bit on what we're setting here rather than just saying "the setting". It looks like `XMC_TC` here.

https://github.com/llvm/llvm-project/pull/66316