[ORC][ORC-RT] Make WrapperFunctionCall::Create support void functions.

Serialized calls to void-wrapper-functions should have zero bytes of argument
data, but accessing ArgData[0] may (and will, in the case of SmallVector) fail
if the argument data buffer is empty.

This commit fixes the issue by adding a check for empty argument buffers.

GitOrigin-RevId: 0e43f3b04d527776458df7aa1d7ce1787ff0b32f
2 files changed