[clang] [llvm] [X86][APX] Emit SetZUCC instead of legacy setcc when ZU is enabled (PR #173965)

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github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 167509 tests passed
* 2974 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM
<details>
<summary>LLVM.CodeGen/X86/apx/setzucc.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc < /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/X86/apx/setzucc.ll -mtriple=x86_64 -mattr=+zu,-prefer-setzucc | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/X86/apx/setzucc.ll --check-prefixes=CHECK,PREFER_NO_SETZUCC
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc -mtriple=x86_64 -mattr=+zu,-prefer-setzucc
# note: command had no output on stdout or stderr
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/X86/apx/setzucc.ll --check-prefixes=CHECK,PREFER_NO_SETZUCC
# .---command stderr------------
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/X86/apx/setzucc.ll:55:27: error: PREFER_NO_SETZUCC-NEXT: is not on the line after the previous match
# | ; PREFER_NO_SETZUCC-NEXT: xorl %edx, %edx
# |                           ^
# | <stdin>:56:2: note: 'next' match was here
# |  xorl %edx, %edx
# |  ^
# | <stdin>:54:17: note: previous match ended here
# |  xorl %eax, %eax
# |                 ^
# | <stdin>:55:1: note: non-matching line after previous match is here
# |  xorl %ecx, %ecx
# | ^
# | 
# | Input file: <stdin>
# | Check file: /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/X86/apx/setzucc.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |          .
# |          .
# |          .
# |         51:  .type flags_copy_lowering, at function 
# |         52: flags_copy_lowering: # @flags_copy_lowering 
# |         53: # %bb.0: # %bb 
# |         54:  xorl %eax, %eax 
# |         55:  xorl %ecx, %ecx 
# |         56:  xorl %edx, %edx 
# | next:55      !~~~~~~~~~~~~~~  error: match on wrong line
# |         57:  .p2align 4 
# |         58: .LBB4_1: # %bb1 
# |         59:  # =>This Inner Loop Header: Depth=1 
# |         60:  addl %ecx, 0 
# |         61:  setb %cl 
# |          .
# |          .
# |          .
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/173965