Share instruction decoding mechanism between Intel derived processors.

Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>

src/IntelProcessor.cpp

@@ -9,6 +9,11 @@ EightBit::IntelProcessor::IntelProcessor(Memory& memory)
 
 void EightBit::IntelProcessor::initialise() {
 	Processor::initialise();
+
+	for (int i = 0; i < 0x100; ++i) {
+		m_decodedOpcodes[i] = i;
+	}
+
 	MEMPTR().word = 0;
 	SP().word = 0xffff;
 }