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This particular cast appears to have been copied over from clang, but there are plenty of other call sites in clang that don't bother with a cast here, and it works fine without one. For context, `llvm::Intrinsic::ID` is a typedef for `unsigned`, and `llvm::Intrinsic::instrprof_increment` is a member of `enum IndependentIntrinsics : unsigned`.
This directory currently contains some LLVM support code. This will generally be sent upstream to LLVM in time; for now it lives here. NOTE: the LLVM C++ ABI is subject to between-version breakage and must *never* be exposed to Rust. To allow for easy auditing of that, all Rust-exposed types must be typedef-ed as "LLVMXyz", or "LLVMRustXyz" if they were defined here. Functions that return a failure status and leave the error in the LLVM last error should return an LLVMRustResult rather than an int or anything to avoid confusion. When translating enums, add a single `Other` variant as the first one to allow for new variants to be added. It should abort when used as an input. All other types must not be typedef-ed as such.