Use C type when passing value to LLVM pass
Previously the C type LLVMRelocMode (available as RelocMode in Rust) was passed as is to the function. However createTargetMachine expects a Reloc::Model, which is an enum just one value short. Additionally, the function was marked as requiring Reloc::Model in the C code, but RelocMode on the Rust-side. We now use the correct C type LLVMRelocMode and convert it to an Optional<Reloc::Model> as expected by the createTargetMachine call the same the original LLVMCreateTargetMachine function does. See https://github.com/llvm-mirror/llvm/blob/c9b262bfbd5b9fb6f10749dba1465569f39bd625/lib/Target/TargetMachineC.cpp#L104-L121 This was found by @EddyB.
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