[llvm] [LangRef] Fix evl type on float VP reduction intrinsics (PR #115421)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve-vla-2stage` running on `linaro-g3-04` while building `llvm` at step 18 "test-suite".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/41/builds/3343

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

```
Step 18 (test-suite) failure: 1200 seconds without output running [b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/test/sandbox/bin/python', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/test/sandbox/bin/lnt', b'runtest', b'test-suite', b'--no-timestamp', b'--sandbox', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/test/sandbox', b'--test-suite', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/test/test-suite', b'--cc', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2.install/bin/clang', b'--cxx', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2.install/bin/clang++', b'--use-lit', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1/bin/llvm-lit', b'--build-tool-options', b'"-k"', b'--cmake-define=TEST_SUITE_FORTRAN:STRING=ON', b'--cmake-define=CMAKE_Fortran_COMPILER=/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2.install/bin/flang', b'--cppflags', b'-mcpu=neoverse-512tvb -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -O3', b'--threads=32', b'--build-threads=32'], attempting to kill
...
    exec_time:  4.6246 
*** MICRO-TEST: benchForLoopWithReductionAutoVecTC7
    exec_time:  3.9020 
*** MICRO-TEST: benchForLoopWithReductionAutoVecTC8
    exec_time:  2.3538 

Testing Time: 1060.50s

Total Discovered Tests: 9992
  Passed: 9992 (100.00%)
command timed out: 1200 seconds without output running [b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/test/sandbox/bin/python', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/test/sandbox/bin/lnt', b'runtest', b'test-suite', b'--no-timestamp', b'--sandbox', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/test/sandbox', b'--test-suite', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/test/test-suite', b'--cc', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2.install/bin/clang', b'--cxx', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2.install/bin/clang++', b'--use-lit', b'/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1/bin/llvm-lit', b'--build-tool-options', b'"-k"', b'--cmake-define=TEST_SUITE_FORTRAN:STRING=ON', b'--cmake-define=CMAKE_Fortran_COMPILER=/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2.install/bin/flang', b'--cppflags', b'-mcpu=neoverse-512tvb -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -O3', b'--threads=32', b'--build-threads=32'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=3790.271309

```

</details>

https://github.com/llvm/llvm-project/pull/115421