[llvm] [AArch64] Add ISel patterns for LDAPURS* instructions (PR #171788)

[Cullen Rhodes via llvm-commits]

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@@ -59,6 +59,44 @@ define i8 @load_atomic_i8_aligned_acquire(ptr %ptr) {
     ret i8 %r
 }
 
+define i32 @load_atomic_i8_aligned_acquire_sext_i32(ptr %ptr) {
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c-rhodes wrote:

did you use `llvm/utils/update_llc_test_checks.py` to generate the CHECK lines? I noticed in the existing test above `SDAG-NOAVOIDLDAPUR` comes before `SDAG-AVOIDLDAPUR` and when i run the script i'm seeing a diff

Also, pre-committing tests or staging the PR commits so the before/after can be seen makes reviewing these sort of patches much easier. I'm not requesting any changes, but just something to bear in mind in future.

https://github.com/llvm/llvm-project/pull/171788