Add Kokkos ports for 481 HeCBench benchmarks

[Copilot]

Summary

This PR adds Kokkos implementations for 481 HeCBench benchmarks, enabling them to run on various hardware backends (CPU/Serial, OpenMP, CUDA, HIP, SYCL, etc.) via the Kokkos performance portability framework.

Changes

Each *-kokkos directory contains:

• Makefile — builds using $(KOKKOS_PATH)/Makefile.kokkos
• main.cpp — Kokkos implementation using Kokkos::View, Kokkos::parallel_for, Kokkos::parallel_reduce, Kokkos::deep_copy, etc.
• Any required header files

Files changed: 1,115 files across 481 *-kokkos directories

Fork Limitation Note

⚠️ This fork (kento/HeCBench) has exceeded its Git LFS storage budget, so .gitattributes and the *.tar.bz data files present in RIKEN-RCCS/HeCBench:master are not included in this branch. When merging, please ensure these files are preserved (do not merge the deletions of .gitattributes and src/*/data.tar.bz files).

Build Instructions

# Set Kokkos path (source tree)
export KOKKOS_PATH=/path/to/kokkos

# Build with OpenMP backend
KOKKOS_DEVICES=OpenMP make main

# Build with CUDA backend  
KOKKOS_DEVICES=Cuda KOKKOS_ARCH="Volta70" make main

Testing

Each benchmark has been verified to compile and produce correct results with the Kokkos Serial backend.