[llvm] [aarch64] atan2 intrinsic lowering (p5) (PR #112611)

[Tex Riddell via llvm-commits]

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+# RUN: llc -verify-machineinstrs -mtriple aarch64--- \
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tex3d wrote:

Before, this test was manually adapted from the pattern used for some of the other arc/hyperbolic intrinsics (such as legalize-atan.mir).  I updated the test to the result of using update_mir_test_checks.py instead.

https://github.com/llvm/llvm-project/pull/112611