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Allow assignations as expression

This is another step to have full support for expressions. With this step
we can see more cases and continue building the primitives.

--- a/cc2/cgen.c

+++ b/cc2/cgen.c

@@ -1,5 +1,5 @@

-#include <stdarg.h>

+#include <assert.h>

 #include <inttypes.h>

 #include <stdlib.h>

@@ -140,6 +140,9 @@

 		case INDEX:

 			code(LDI, r, np);

 			break;

+		case REG:

+			code(MOV, r, np);

+			break;

 		default:

 			abort();

 		}

@@ -313,6 +316,7 @@

 {

 	Node *lp = np->left, *rp = np->right;

+	assert(rp->op == REG);

 	switch (np->type.size) {

 	case 1:

 		switch (lp->op) {

@@ -320,9 +324,11 @@

 			code(LDL, lp, rp);

 			break;

 		case REG:

+			/* TODO: what happens with the previous register? */

 			code(MOV, lp, rp);

 			break;

 		case MEM:

+			/* TODO: check if the variable is indexed */

 			index(lp);

 			code(LDL, lp, rp);

 			break;

@@ -333,6 +339,8 @@

 	default:

 		abort();

 	}

+	np->op = REG;

+	np->reg = rp->reg;

 }