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Added tree struct for while statement

--- a/flow.c

+++ b/flow.c

@@ -18,12 +18,13 @@

 static struct node *

 do_while(void)

 {

+	register struct node *cond;

+

 	expect(WHILE);

 	expect('(');

-	expr();

+	cond = expr();

 	expect(')');

-	stmt();

-	return NULL;

+	return node2(OWHILE, cond, stmt());

 }

 static struct node *

@@ -76,13 +77,13 @@

 static struct node *

 do_switch(void)

 {

-	register struct node *e1;

+	register struct node *cond;

 	expect(SWITCH);

 	expect('(');

-	e1 = expr();

+	cond = expr();

 	expect(')');

-	return node2(OSWITCH, e1, stmt());

+	return node2(OSWITCH, cond, stmt());

 }

 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, ODO

+	OFEXP, ODO, OWHILE

 };

 struct node;

--- a/tree.c

+++ b/tree.c

@@ -181,7 +181,8 @@

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

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

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

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

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

+		[OWHILE] = {2, "while"},

 	};

 	if (!np) {

 		fputs(" nil", stdout);