[llvm] [LV] Add more tests for blend masks. NFC (PR #186751)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `openmp-offload-amdgpu-runtime-2` running on `rocm-worker-hw-02` while building `llvm` at step 10 "Add check check-libc-amdgcn-amd-amdhsa".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/10/builds/24624

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

```
Step 10 (Add check check-libc-amdgcn-amd-amdhsa) failure: test (failure)
...
[       OK ] LlvmLibcFMinimumMagNumTest.InfArg (4 us)
[ RUN      ] LlvmLibcFMinimumMagNumTest.NegInfArg
[       OK ] LlvmLibcFMinimumMagNumTest.NegInfArg (4 us)
[ RUN      ] LlvmLibcFMinimumMagNumTest.BothZero
[       OK ] LlvmLibcFMinimumMagNumTest.BothZero (3 us)
[ RUN      ] LlvmLibcFMinimumMagNumTest.Range
[       OK ] LlvmLibcFMinimumMagNumTest.Range (11 ms)
Ran 5 tests.  PASS: 5  FAIL: 0
[2590/3360] Linking CXX executable libc/test/src/math/smoke/libc.test.src.math.smoke.getpayloadf_test.__hermetic__.__build__
[2591/3360] Running hermetic test libc.test.src.math.fmaxl_test.__hermetic__
FAILED: libc/test/src/math/libc.test.src.math.fmaxl_test.__hermetic__.__cmd__ /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-amdgcn-amd-amdhsa-bins/libc/test/src/math/libc.test.src.math.fmaxl_test.__hermetic__.__cmd__ 
cd /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-amdgcn-amd-amdhsa-bins/libc/test/src/math && /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/llvm-gpu-loader /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-amdgcn-amd-amdhsa-bins/libc/test/src/math/libc.test.src.math.fmaxl_test.__hermetic__.__build__
[==========] Running 5 tests from 1 test suite.
[ RUN      ] LlvmLibcFMaxTest.NaN
[       OK ] LlvmLibcFMaxTest.NaN (6 us)
[ RUN      ] LlvmLibcFMaxTest.InfArg
[       OK ] LlvmLibcFMaxTest.InfArg (6 us)
[ RUN      ] LlvmLibcFMaxTest.NegInfArg
[       OK ] LlvmLibcFMaxTest.NegInfArg (5 us)
[ RUN      ] LlvmLibcFMaxTest.BothZero
[       OK ] LlvmLibcFMaxTest.BothZero (2 us)
[ RUN      ] LlvmLibcFMaxTest.Range
[       OK ] LlvmLibcFMaxTest.Range (118 ms)
Ran 5 tests.  PASS: 5  FAIL: 0
[2592/3360] Running hermetic test libc.test.src.math.smoke.fmull_test.__hermetic__
[==========] Running 4 tests from 1 test suite.
[ RUN      ] LlvmLibcMulTest.SpecialNumbers
[       OK ] LlvmLibcMulTest.SpecialNumbers (25 us)
[ RUN      ] LlvmLibcMulTest.InvalidOperations
[       OK ] LlvmLibcMulTest.InvalidOperations (6 us)
[ RUN      ] LlvmLibcMulTest.RangeErrors
[       OK ] LlvmLibcMulTest.RangeErrors (9 us)
[ RUN      ] LlvmLibcMulTest.InexactResults
[       OK ] LlvmLibcMulTest.InexactResults (1 us)
Ran 4 tests.  PASS: 4  FAIL: 0
[2593/3360] Running hermetic test libc.test.src.math.smoke.fminimum_mag_numf16_test.__hermetic__
[==========] Running 5 tests from 1 test suite.
[ RUN      ] LlvmLibcFMinimumMagNumTest.NaN
[       OK ] LlvmLibcFMinimumMagNumTest.NaN (13 us)
[ RUN      ] LlvmLibcFMinimumMagNumTest.InfArg
[       OK ] LlvmLibcFMinimumMagNumTest.InfArg (4 us)
[ RUN      ] LlvmLibcFMinimumMagNumTest.NegInfArg
[       OK ] LlvmLibcFMinimumMagNumTest.NegInfArg (3 us)
[ RUN      ] LlvmLibcFMinimumMagNumTest.BothZero
[       OK ] LlvmLibcFMinimumMagNumTest.BothZero (4 us)
[ RUN      ] LlvmLibcFMinimumMagNumTest.Range
[       OK ] LlvmLibcFMinimumMagNumTest.Range (11 ms)
Ran 5 tests.  PASS: 5  FAIL: 0
[2594/3360] Linking CXX executable libc/test/src/math/smoke/libc.test.src.math.smoke.getpayload_test.__hermetic__.__build__

```

</details>

https://github.com/llvm/llvm-project/pull/186751