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This is a branch off of https://github.com/llvm/llvm-project/pull/159856, in which consists of the runtime portion of the changes required to support indirect function and virtual function calls on an `omp target device` when the virtual class / indirect function is mapped to the device from the host. Key Changes - Introduced a new flag OMP_DECLARE_TARGET_INDIRECT_VTABLE to mark VTable registrations - Modified setupIndirectCallTable to support both VTable entries and indirect function pointers Details: The setupIndirectCallTable implementation was modified to support this registration type by retrieving the first address of the VTable and inferring the remaining data needed to build the indirect call table. Since the Vtables / Classes registered as indirect can be larger than 8 bytes, and the vtables may not be at the first address we either need to pass the size to __llvm_omp_indirect_call_lookup and have a check at each step of the binary search, or add multiple entries to the indirect table for each address registered. The latter was chosen. Commit: a00def3f20e166d4fb9328e6f0bc0742cd0afa31 is not a part of this PR and is handled / reviewed in: https://github.com/llvm/llvm-project/pull/159856, This is PR (2/3) Register Vtable PR (1/3): https://github.com/llvm/llvm-project/pull/159856, Codegen / _llvm_omp_indirect_call_lookup PR (3/3): https://github.com/llvm/llvm-project/pull/159857