[llvm] [X86] vector-reduce-or-cmp.ll - add v4i64 signbit test coverage (PR #165588)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-darwin` running on `doug-worker-3` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/23/builds/15097

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: Index/pch-with-module.m' FAILED ********************
Exit Code: 127

Command Output (stdout):
--
# RUN: at line 2
rm -rf /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Index/Output/pch-with-module.m.tmp.cache
# executed command: rm -rf /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Index/Output/pch-with-module.m.tmp.cache
# note: command had no output on stdout or stderr
# RUN: at line 3
rm -rf /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Index/Output/pch-with-module.m.tmp.h.pch
# executed command: rm -rf /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Index/Output/pch-with-module.m.tmp.h.pch
# note: command had no output on stdout or stderr
# RUN: at line 4
/Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/bin/c-index-test -write-pch /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Index/Output/pch-with-module.m.tmp.h.pch /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/Index/pch-with-module.m -target x86_64-apple-macosx10.7 -fobjc-arc -fmodules-cache-path=/Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Index/Output/pch-with-module.m.tmp.cache -fmodules -F /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/Index/../Modules/Inputs -Xclang -fdisable-module-hash
# executed command: /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/bin/c-index-test -write-pch /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Index/Output/pch-with-module.m.tmp.h.pch /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/Index/pch-with-module.m -target x86_64-apple-macosx10.7 -fobjc-arc -fmodules-cache-path=/Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Index/Output/pch-with-module.m.tmp.cache -fmodules -F /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/Index/../Modules/Inputs -Xclang -fdisable-module-hash
# .---command stderr------------
# | Could not create process (/Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/bin/c-index-test) due to [Errno 24] Too many open files
# `-----------------------------
# error: command failed with exit status: 127

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/165588