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

[Amy Kwan via cfe-commits]

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@@ -1356,6 +1382,11 @@ void PPCAsmPrinter::emitInstruction(const MachineInstr *MI) {
                    .addExpr(SymGotTlsGD));
     return;
   }
+  case PPC::GETtlsMOD32AIX:
+  case PPC::GETtlsMOD64AIX:
+    // Transform: %r3 = GETtlsMODNNAIX %r3 (for NN == 32/64).
+    // Into: BLA .__tls_get_mod()
+    // Input parameter is a module handle (__TLSML[TC]@ml) for all variables.
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amy-kwan wrote:

```suggestion
    // Input parameter is a module handle (_TLSML[TC]@ml) for all variables.
```
Single `_`?

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