[llvm] [PowerPC][AIX] Enable aix-small-local-dynamic-tls target attribute without folding opt (PR #86641)

[Amy Kwan via llvm-commits]

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@@ -329,6 +329,15 @@ def FeatureAIXLocalExecTLS :
                    "Produce a TOC-free local-exec TLS sequence for this function "
                    "for 64-bit AIX">;
 
+// Specifies that local-dynamic TLS accesses in any function with this target
+// attribute should use the optimized sequence (where the offset is an immediate
+// off module-hlandle for which the linker might add fix-up code if the
+// immediate is too large).
+def FeatureAIXLocalDynamicTLS :
+  SubtargetFeature<"aix-small-local-dynamic-tls", "HasAIXSmallLocalDynamicTLS",
+                   "true", "Produce a faster local-dynamic TLS sequence for this "
+                   " function for 64-bit AIX">;
----------------
amy-kwan wrote:

```suggestion
                   "function for 64-bit AIX">;
```

https://github.com/llvm/llvm-project/pull/86641