Function LLVMGetInstructionCallConv 

pub unsafe extern "C" fn LLVMGetInstructionCallConv(
    Instr: LLVMValueRef,
) -> c_uint

Obtain the calling convention for a call instruction.

This is the opposite of LLVMSetInstructionCallConv(). Reads its usage.

@see LLVMSetInstructionCallConv()