[llvm] [AArch64] Put legal action first for G_ATOMIC_CMPXCHG (PR #74613)

[Thomas Preud'homme via llvm-commits]

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@@ -758,11 +758,11 @@ AArch64LegalizerInfo::AArch64LegalizerInfo(const AArch64Subtarget &ST)
           all(typeInSet(0, {s8, s16, s32, s64, s128}), typeIs(2, p0)));
 
   getActionDefinitionsBuilder(G_ATOMIC_CMPXCHG)
+      .clampScalar(0, s32, s128)
+      .legalIf(all(typeInSet(0, {s32, s64}), typeIs(1, p0)))
       .customIf([](const LegalityQuery &Query) {
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RoboTux wrote:

That should become a simple custom()

https://github.com/llvm/llvm-project/pull/74613