[llvm] [NFC] add a pre-commit test case for patch 122741 (PR #135247)

[via llvm-commits]

dyung wrote:

> I believe this is revealing a test failure:
> 
> ```
> llvm> /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/build/bin/llc -verify-machineinstrs -mtriple powerpc-ibm-aix-xcoff -debug-only=isel    /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/test/CodeGen/PowerPC/undef-args.ll -o - 2>&1 | /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/build/bin/FileCheck --check-prefix=CHECKISEL32 /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/test/CodeGen/PowerPC/undef-args.ll # RUN: at line 4
> llvm> + /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/build/bin/llc -verify-machineinstrs -mtriple powerpc-ibm-aix-xcoff -debug-only=isel /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/test/CodeGen/PowerPC/undef-args.ll -o -
> llvm> + /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/build/bin/FileCheck --check-prefix=CHECKISEL32 /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/test/CodeGen/PowerPC/undef-args.ll
> llvm> /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/test/CodeGen/PowerPC/undef-args.ll:30:16: error: CHECKISEL32: expected string not found in input
> llvm> ; CHECKISEL32: Initial selection DAG: %bb.0 'test32:entry'
> llvm>                ^
> llvm> <stdin>:1:1: note: scanning from here
> llvm> llc: Unknown command line argument '-debug-only=isel'. Try: '/build/llvm-src-21.0.0-unstable-2025-04-10/llvm/build/bin/llc --help'
> llvm> ^
> llvm> <stdin>:1:108: note: possible intended match here
> llvm> llc: Unknown command line argument '-debug-only=isel'. Try: '/build/llvm-src-21.0.0-unstable-2025-04-10/llvm/build/bin/llc --help'
> llvm>                                                                                                            ^
> llvm>
> llvm> Input file: <stdin>
> llvm> Check file: /build/llvm-src-21.0.0-unstable-2025-04-10/llvm/test/CodeGen/PowerPC/undef-args.ll
> llvm>
> llvm> -dump-input=help explains the following input dump.
> llvm>
> llvm> Input was:
> llvm> <<<<<<
> llvm>             1: llc: Unknown command line argument '-debug-only=isel'. Try: '/build/llvm-src-21.0.0-unstable-2025-04-10/llvm/build/bin/llc --help'
> llvm> check:30'0     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
> llvm> check:30'1                                                                                                                ?                        possible intended match
> llvm>             2: llc: Did you mean '--debug-pass=isel'?
> llvm> check:30'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> llvm> >>>>>>
> llvm>
> llvm> --
> llvm>
> llvm> ********************
> llvm> ********************
> llvm> Failed Tests (1):
> llvm>   LLVM :: CodeGen/PowerPC/undef-args.ll
> ```

The same issue is showing up on a build bot https://lab.llvm.org/buildbot/#/builders/202/builds/601.

Most likely the test needs a `REQUIRES: asserts`.

https://github.com/llvm/llvm-project/pull/135247