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Add Inst data type in cc2

This type is the base for the instruction in the memory.
The idea is to have a list of these instructions, so we can
optimize them before of any operation.

--- a/cc2/code.c

+++ b/cc2/code.c

@@ -8,7 +8,24 @@

 #include "../inc/cc.h"

 #include "cc2.h"

+typedef struct inst Inst;

+typedef struct addr Addr;

+struct addr {

+	char kind;

+	union {

+		char reg;

+		Inst *pc;

+		Symbol *sym;

+	} u;

+};

+

+struct inst {

+	char op;

+	Addr from, to;

+	Inst *next;

+};

+

 static char *opnames[] = {

 	[PUSH] = "PUSH", [POP] = "POP", [LD]  = "LD", [ADD] = "ADD",

 	[RET]  = "RET" , [ADDI]= "ADD", [LDI] = "LD", [ADDX] = "ADD",

@@ -35,6 +52,24 @@

 	[LDFX] = "\to\tr,(r+i)",

 	[LDX]  = "\to\t(r+i),r",

 };

+

+Inst *prog, *pc;

+

+Inst *

+inst(uint8_t op)

+{

+	Inst *new;

+

+	new = xmalloc(sizeof(*new));

+	if (!pc)

+		prog = new;

+	else

+		pc->next = new;

+	pc = new;

+	pc->op = op;

+	pc->next = NULL;

+	return pc;

+}

 void

 code(char op, ...)