sparse-llvm: void return type compiles to i8

Hi!

A simple function like this will compile to the following llvm bitcode:

	/* C */
	void func(void) {
		return;
	}

	/* LLVM */
	define i8 @func() {
	L0:
	  ret void
	}

The return type of the function and the type in the return instruction don't match.

I found this inconsistency by running LLVM's bitcode validation on the bitcode produced by sparse-llvm.

Greetings,
Jonathan Neuschäfer
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