[llvm] [AArch64][FEAT_CMPBR] Codegen for Armv9.6-a compare-and-branch (PR #116465)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple arm64-apple-ios -mattr +cmpbr -verify-machineinstrs -o - < %s | FileCheck %s
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SpencerAbson wrote:

For these positive tests, might it be worth changing this to:
```suggestion
; RUN: llc -mtriple arm64-apple-ios -verify-machineinstrs -o - < %s | FileCheck %s -check-prefix=CHECK-NO-CMPBR
; RUN: llc -mtriple arm64-apple-ios -mattr +cmpbr -verify-machineinstrs -o - < %s | FileCheck %s -check-prefix=CHECK-CMPBR
```
?

https://github.com/llvm/llvm-project/pull/116465