public int evalNext() throws IOException {
		return eval(pc);
	}
Returns the value encoded into the table at the specified pc.

@param targetPC pc
@return value at specified pc, or -1 if error evaluating table
@throws IOException if error reading data
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/golang/rtti/GoPcValueEvaluator.java