[llvm] AMDGPU: Fix broken exp10 lowering for f16 (PR #170582)

[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 6 "test-openmp".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/10/builds/18462

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

```
Step 6 (test-openmp) failure: test (failure)
...
PASS: libomp :: env/kmp_set_dispatch_buf.c (454 of 463)
PASS: ompd-test :: openmp_examples/parallel.c (455 of 463)
PASS: libomp :: worksharing/single/omp_single.c (456 of 463)
PASS: ompd-test :: openmp_examples/fibonacci.c (457 of 463)
PASS: libomp :: tasking/issue-69733.c (458 of 463)
PASS: libomp :: tasking/issue-94260-2.c (459 of 463)
PASS: libomp :: worksharing/for/omp_collapse_many_GTGEGT_int.c (460 of 463)
PASS: libomp :: worksharing/for/omp_collapse_many_GELTGT_int.c (461 of 463)
PASS: libomp :: worksharing/for/omp_collapse_many_LTLEGE_int.c (462 of 463)
TIMEOUT: libomp :: ompt/cancel/cancel_parallel.c (463 of 463)
******************** TEST 'libomp :: ompt/cancel/cancel_parallel.c' FAILED ********************
Exit Code: 2
Timeout: Reached timeout of 100 seconds

Command Output (stdout):
--
# RUN: at line 2
/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/./bin/clang -fopenmp   -I /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -I /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/openmp/runtime/test -L /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/src  -fno-omit-frame-pointer -I /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/openmp/runtime/test/ompt /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/openmp/runtime/test/ompt/cancel/cancel_parallel.c -o /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/ompt/cancel/Output/cancel_parallel.c.tmp -lm -latomic && env OMP_CANCELLATION=true /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/ompt/cancel/Output/cancel_parallel.c.tmp | sort -n -s | tee /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/ompt/cancel/Output/cancel_parallel.c.tmp.out | /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/./bin/FileCheck /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/openmp/runtime/test/ompt/cancel/cancel_parallel.c
# executed command: /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/./bin/clang -fopenmp -I /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -I /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/openmp/runtime/test -L /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -fno-omit-frame-pointer -I /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/openmp/runtime/test/ompt /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/openmp/runtime/test/ompt/cancel/cancel_parallel.c -o /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/ompt/cancel/Output/cancel_parallel.c.tmp -lm -latomic
# note: command had no output on stdout or stderr
# executed command: env OMP_CANCELLATION=true /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/ompt/cancel/Output/cancel_parallel.c.tmp
# note: command had no output on stdout or stderr
# error: command failed with exit status: -9
# error: command reached timeout: True
# executed command: sort -n -s
# note: command had no output on stdout or stderr
# error: command reached timeout: True
# executed command: tee /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/ompt/cancel/Output/cancel_parallel.c.tmp.out
# note: command had no output on stdout or stderr
# error: command reached timeout: True
# executed command: /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/./bin/FileCheck /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/openmp/runtime/test/ompt/cancel/cancel_parallel.c
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/./bin/FileCheck /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/openmp/runtime/test/ompt/cancel/cancel_parallel.c
# `-----------------------------
# error: command failed with exit status: 2
# error: command reached timeout: True

--

********************
Slowest Tests:
--------------------------------------------------------------------------
100.04s: libomp :: ompt/cancel/cancel_parallel.c
33.83s: libomp :: worksharing/for/omp_collapse_many_LTLEGE_int.c
30.97s: libomp :: tasking/issue-94260-2.c
30.52s: libomp :: worksharing/for/omp_collapse_many_GELTGT_int.c
30.31s: libomp :: worksharing/for/omp_collapse_many_GTGEGT_int.c
30.29s: libomp :: tasking/issue-69733.c

```

</details>

https://github.com/llvm/llvm-project/pull/170582