Function LLVMBuildCast 

#[unsafe(no_mangle)]
pub extern "C" fn LLVMBuildCast(
    B: LLVMBuilderRef,
    Op: LLVMOpcode,
    Val: LLVMValueRef,
    DestTy: LLVMTypeRef,
    Name: *const c_char,
) -> LLVMValueRef