protected Varnode getMemoryValue(Varnode varnode, boolean signed) {
		return getMemoryValue(memoryVals, 0, varnode, signed);
	}
Search the value state stack for the first occurrence of the set value

@param varnode varnode to search for a value
@param signed true if retrieving a signed value
@return first value found on stack, null otherwise
Ghidra/Features/Base/src/main/java/ghidra/program/util/VarnodeContext.java