default TraceMemoryState getState(long snap, Register register) {
		return getState(getTrace().getPlatformManager().getHostPlatform(), snap, register);
	}
Assert that a register's range has a single state at the given snap and get that state

@param snap the time
@param register the register to examine
@return the state
@throws IllegalStateException if the register is mapped to more than one state. See
            {@link #getStates(long, Register)}
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/model/memory/TraceMemoryOperations.java