public String getRegValueRepresentation(Address addr, Register reg) {
		return symEval.getRegisterValueRepresentation(addr, reg);
	}
Get the stack register value as a printable string.  This can be an equation
of register+value.

 To have a valid value, the class must be constructed to storeDepthAtEachInstuction
 
@param addr the address of the register value to get the representation of.
@param reg the register to get the representation of.
@return the string representation of the register value.
Ghidra/Features/Base/src/main/java/ghidra/app/cmd/function/CallDepthChangeInfo.java