Function LLVMSetFunctionCallConv 

pub unsafe extern "C" fn LLVMSetFunctionCallConv(
    Fn: LLVMValueRef,
    CC: c_uint,
)

Set the calling convention of a function.

@see llvm::Function::setCallingConv()

@param Fn Function to operate on @param CC LLVMCallConv to set calling convention to