[llvm] [LoongArch][NFC] Pre-commit tests for vector ceil,floor,trunc,roundeven (PR #165213)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc --mtriple=loongarch32 --mattr=+32s,+lasx < %s | FileCheck %s --check-prefix=CHECK
+; RUN: llc --mtriple=loongarch64 --mattr=+lasx < %s | FileCheck %s --check-prefix=CHECK
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zhaoqi5 wrote:

```suggestion
; RUN: llc --mtriple=loongarch64 --mattr=+lasx < %s | FileCheck %s
```

https://github.com/llvm/llvm-project/pull/165213