[llvm] [WebAssembly] Implement trunc_sat and convert instructions for f16x8. (PR #95180)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `openmp-offload-libc-amdgpu-runtime` running on `omp-vega20-1` while building `llvm` at step 10 "Add check check-offload".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/73/builds/663

Here is the relevant piece of the build log for the reference:
```
Step 10 (Add check check-offload) failure: 1200 seconds without output running [b'ninja', b'-j 32', b'check-offload'], attempting to kill
...
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/offloading_success.cpp (709 of 759)
UNSUPPORTED: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/workshare_chunk.c (710 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/dynamic_module.c (711 of 759)
UNSUPPORTED: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/target_memcpy.c (712 of 759)
UNSUPPORTED: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/target_memcpy_emi.c (713 of 759)
UNSUPPORTED: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/veccopy.c (714 of 759)
UNSUPPORTED: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/veccopy_data.c (715 of 759)
UNSUPPORTED: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/veccopy_disallow_both.c (716 of 759)
UNSUPPORTED: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/veccopy_emi.c (717 of 759)
UNSUPPORTED: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/veccopy_emi_map.c (718 of 759)
UNSUPPORTED: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/veccopy_map.c (719 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/target-tile.c (720 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/static_linking.c (721 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/target_constexpr_mapping.cpp (722 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/target-teams-atomic.c (723 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/target_depend_nowait.cpp (724 of 759)
PASS: libomptarget :: amdgcn-amd-amdhsa :: offloading/parallel_target_teams_reduction_max.cpp (725 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/shared_lib_fp_mapping.c (726 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/task_in_reduction_target.c (727 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: unified_shared_memory/associate_ptr.c (728 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/weak.c (729 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/thread_state_2.c (730 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: mapping/lambda_mapping.cpp (731 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: unified_shared_memory/api.c (732 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/multiple_reductions_simple.c (733 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/veccopy_no_device_init.c (734 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: ompt/veccopy_wrong_return.c (735 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/malloc.c (736 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: unified_shared_memory/close_enter_exit.c (737 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: unified_shared_memory/close_member.c (738 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/requires.c (739 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: unified_shared_memory/close_modifier.c (740 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: unified_shared_memory/close_manual.c (741 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: unified_shared_memory/shared_update.c (742 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/bug51781.c (743 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/target_nowait_target.cpp (744 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/thread_state_1.c (745 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/malloc_parallel.c (746 of 759)
PASS: libomptarget :: amdgcn-amd-amdhsa :: offloading/bug49021.cpp (747 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/bug53727.cpp (748 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/bug47654.cpp (749 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/test_libc.cpp (750 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/wtime.c (751 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/bug49779.cpp (752 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/bug50022.cpp (753 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu :: offloading/bug49021.cpp (754 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu :: offloading/std_complex_arithmetic.cpp (755 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/complex_reduction.cpp (756 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/bug49021.cpp (757 of 759)
PASS: libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/std_complex_arithmetic.cpp (758 of 759)

```

https://github.com/llvm/llvm-project/pull/95180