[llvm] [X86] Prevent APX NDD compression when it creates a partial write (PR #132051)

[Phoebe Wang 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 %s -mtriple=x86_64-unknown -mattr=+ndd,+egpr -start-before=break-false-deps -verify-machineinstrs -show-mc-encoding -o - | FileCheck --check-prefixes=ASM,RCDEFAULT %s
+# RUN: llc %s -mtriple=x86_64-unknown -mattr=+ndd,+egpr -start-before=break-false-deps -verify-machineinstrs -partial-reg-update-clearance=1 -show-mc-encoding -o - | FileCheck --check-prefixes=ASM,RC1 %s
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phoebewang wrote:

Nit: We usually use CHECK/COMMON/ALL for the shared one.

https://github.com/llvm/llvm-project/pull/132051