[llvm] [NFC][PowerPC] Optimize vector compares for not equal to non zero vectors (PR #171635)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-armv7-global-isel` running on `linaro-clang-armv7-global-isel` while building `llvm` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/39/builds/9073

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: CodeGen/X86/2009-03-23-MultiUseSched.ll' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 3
/home/tcwg-buildbot/worker/clang-armv7-global-isel/stage1/bin/llc < /home/tcwg-buildbot/worker/clang-armv7-global-isel/llvm/llvm/test/CodeGen/X86/2009-03-23-MultiUseSched.ll -mtriple=x86_64-linux -mcpu=corei7 -relocation-model=static | /home/tcwg-buildbot/worker/clang-armv7-global-isel/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv7-global-isel/llvm/llvm/test/CodeGen/X86/2009-03-23-MultiUseSched.ll
# executed command: /home/tcwg-buildbot/worker/clang-armv7-global-isel/stage1/bin/llc -mtriple=x86_64-linux -mcpu=corei7 -relocation-model=static
# .---command stderr------------
# | LLVM ERROR: out of memory
# | Allocation failed
# | PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
# | Stack dump:
# | 0.	Program arguments: /home/tcwg-buildbot/worker/clang-armv7-global-isel/stage1/bin/llc -mtriple=x86_64-linux -mcpu=corei7 -relocation-model=static
# | 1.	Running pass 'Function Pass Manager' on module '<stdin>'.
# | 2.	Running pass 'X86 DAG->DAG Instruction Selection' on function '@foo'
# | #0 0x03e1eda0 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/tcwg-buildbot/worker/clang-armv7-global-isel/stage1/bin/llc+0x39ceda0)
# | #1 0x03e1c264 llvm::sys::RunSignalHandlers() (/home/tcwg-buildbot/worker/clang-armv7-global-isel/stage1/bin/llc+0x39cc264)
# | #2 0x03e1fd60 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
# | #3 0xe853d6f0 __default_rt_sa_restorer ./signal/../sysdeps/unix/sysv/linux/arm/sigrestorer.S:80:0
# | #4 0xe852db06 ./csu/../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:47:0
# | #5 0xe856d292 __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
# | #6 0xe853c840 gsignal ./signal/../sysdeps/posix/raise.c:27:6
# `-----------------------------
# error: command failed with exit status: -6
# executed command: /home/tcwg-buildbot/worker/clang-armv7-global-isel/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv7-global-isel/llvm/llvm/test/CodeGen/X86/2009-03-23-MultiUseSched.ll
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  /home/tcwg-buildbot/worker/clang-armv7-global-isel/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv7-global-isel/llvm/llvm/test/CodeGen/X86/2009-03-23-MultiUseSched.ll
# `-----------------------------
# error: command failed with exit status: 2

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/171635