[llvm] Apply the `AdjustICmpImmAndPred` optimization when it results in a one-instruction immediate materialization over a two-instruction materialization. (PR #83218)

[Jessica Paquette via llvm-commits]

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@@ -658,9 +659,12 @@ tryAdjustICmpImmAndPred(Register RHS, CmpInst::Predicate P,
   // predicate if it is.
   if (Size == 32)
     C = static_cast<uint32_t>(C);
-  if (!isLegalArithImmed(C))
-    return std::nullopt;
-  return {{C, P}};
+  if (isLegalArithImmed(C))
+    return {{C, P}};
+  if (AArch64_AM::isLogicalImmediate(C, Size) &&
+      !AArch64_AM::isLogicalImmediate(OriginalC, Size))
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ornata wrote:

ping on this comment? @resistor

https://github.com/llvm/llvm-project/pull/83218