NativeAOT: Ignore preferSize and always expand TLS (dotnet#97187)

* Always expand TLS for NativeAOT

* Update src/coreclr/jit/helperexpansion.cpp

---------

Co-authored-by: Jan Kotas <jkotas@microsoft.com>

src/coreclr/jit/helperexpansion.cpp

@@ -442,9 +442,15 @@ PhaseStatus Compiler::fgExpandThreadLocalAccess()
         return result;
     }
 
-    // Always expand for NativeAOT because the TLS access will not be generated by NativeAOT
+    // Always expand for NativeAOT because the slow TLS access helper will not be generated by NativeAOT
     const bool isNativeAOT = IsTargetAbi(CORINFO_NATIVEAOT_ABI);
-    if (!isNativeAOT && opts.OptimizationDisabled())
+    if (isNativeAOT)
+    {
+        return fgExpandHelper<&Compiler::fgExpandThreadLocalAccessForCallNativeAOT>(
+            false /* expand rarely run blocks for NativeAOT */);
+    }
+
+    if (opts.OptimizationDisabled())
     {
         JITDUMP("Optimizations aren't allowed - bail out.\n")
         return result;
@@ -459,9 +465,7 @@ PhaseStatus Compiler::fgExpandThreadLocalAccess()
         return result;
     }
 
-    return isNativeAOT ? fgExpandHelper<&Compiler::fgExpandThreadLocalAccessForCallNativeAOT>(
-                             false /* expand rarely run blocks for NativeAOT */)
-                       : fgExpandHelper<&Compiler::fgExpandThreadLocalAccessForCall>(true);
+    return fgExpandHelper<&Compiler::fgExpandThreadLocalAccessForCall>(true);
 }
 
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