[llvm] [LoongArch] Precommit tests for 128-to-256-bit vector insertion and 256-to-128-bit subvector extraction (NFC) (PR #146299)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-windows` running on `linaro-armv8-windows-msvc-05` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/10080

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

```
Step 6 (test) failure: build (failure)
...
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/11/12 (2259 of 2269)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/2/12 (2260 of 2269)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/3/12 (2261 of 2269)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/4/12 (2262 of 2269)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/5/12 (2263 of 2269)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/6/12 (2264 of 2269)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/7/12 (2265 of 2269)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/8/12 (2266 of 2269)
PASS: lldb-unit :: ValueObject/./LLDBValueObjectTests.exe/9/12 (2267 of 2269)
PASS: lldb-unit :: tools/lldb-server/tests/./LLDBServerTests.exe/0/1 (2268 of 2269)
command timed out: 2400 seconds without output running [b'ninja', b'check-lldb'], attempting to kill
program finished with exit code 1
elapsedTime=5228.784585

```

</details>

https://github.com/llvm/llvm-project/pull/146299