Support for per-target Fortran modules #1737
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Adapt the aomp build to llvm/llvm-project#169638 / ROCm/llvm-project#679
The upstream change requires the Flang module files to be built per-target by flang-rt, including for amdgcn-amd-amdhsa. This change adds 'flang-rt' to the LLVM_ENABLE_RUNTIMES for amdgcn-amd-amdhsa to build the modules. The already present runtime 'openmp' will build omp_lib.mod for amdgcn-amd-amdhsa.
This PR does not change
build_openmp.sh: Building the .mod files needs to be done only once. The script setsLIBOMP_FORTRAN_MODULES_COMPILERwhich is the old mechanism to build omp_lib.h. It will just do nothing and can be cleaned up later.