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Added tree struct for do/while statement

--- a/flow.c

+++ b/flow.c

@@ -29,13 +29,17 @@

 static struct node *

 do_do(void)

 {

+	register struct node *cond, *body;

+

 	expect(DO);

-	stmt();

+	body = stmt();

 	expect(WHILE);

 	expect('(');

-	expr();

+	cond = expr();

 	expect(')');

-	return NULL;

+	expect(';');

+

+	return node2(ODO, body, cond);

 }

 static struct node *

--- a/syntax.h

+++ b/syntax.h

@@ -11,7 +11,7 @@

 	OBOR, OAND, OOR, OTERN, OASSIGN, OA_MUL, OA_DIV,

 	OA_MOD, OA_ADD, OA_SUB, OA_SHL, OA_SHR, OA_AND,

 	OA_XOR, OA_OR, OSYM, OCOMP, OSWITCH, OIF, OFOR,

-	OFEXP

+	OFEXP, ODO

 };

 struct node;

--- a/tree.c

+++ b/tree.c

@@ -180,7 +180,8 @@

 		[OSWITCH] = {2, "switch"},

 		[OIF] = {3, "if"},

 		[OFOR] = {2, "for"},

-		[OFEXP] = {3, "efor"}

+		[OFEXP] = {3, "efor"},

+		[ODO] = {2, "do"}

 	};

 	if (!np) {

 		fputs(" nil", stdout);