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

[David Green via llvm-commits]

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@@ -0,0 +1,185 @@
+; RUN: llc -mtriple=aarch64-linux-gnu -global-isel=1 < %s | FileCheck %s
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davemgreen wrote:

Please use update_llc_test_checks and add run lines for both SDAG and GISel.
```
; RUN: llc -mtriple=aarch64-linux-gnu -global-isel=0 < %s | FileCheck %s --check-prefixes=CHECK,CHECK-SD
; RUN: llc -mtriple=aarch64-linux-gnu -global-isel=1 < %s | FileCheck %s --check-prefixes=CHECK,CHECK-GI
```

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