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Add prtree() to cc2

This function prints a tree, that is really useful for debugging.

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -5,6 +5,7 @@

 typedef struct {

 	short size;

 	uint8_t align;

+	char letter;

 	bool sign : 1;

 	bool c_int : 1;

 } Type;

@@ -116,3 +117,4 @@

 extern void apply(Node *list[], void (*fun)(Node *));

 extern Symbol *parse(void);

 extern void code(char op, ...);

+extern void prtree(Node *np);

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -26,6 +26,7 @@

 Type l_int8 = {

+	.letter = L_INT8,

 	.size = 1,

 	.align = 2,

 	.sign = 1,

@@ -33,6 +34,7 @@

 };

 Type l_int16 = {

+	.letter = L_INT16,

 	.size = 2,

 	.align = 2,

 	.sign = 1,

@@ -40,6 +42,7 @@

 };

 Type l_int32 = {

+	.letter = L_INT32,

 	.size = 4,

 	.align = 4,

 	.sign = 1,

@@ -47,6 +50,7 @@

 };

 Type l_int64 = {

+	.letter = L_INT64,

 	.size = 8,

 	.align = 8,

 	.sign = 1,

@@ -54,6 +58,7 @@

 };

 Type l_uint8 = {

+	.letter = L_UINT8,

 	.size = 1,

 	.align = 2,

 	.c_int = 1,

@@ -60,6 +65,7 @@

 };

 Type l_uint16 = {

+	.letter = L_UINT16,

 	.size = 2,

 	.align = 2,

 	.c_int = 1,

@@ -66,6 +72,7 @@

 };

 Type l_uint32 = {

+	.letter = L_UINT32,

 	.size = 4,

 	.align = 4,

 	.c_int = 1,

@@ -72,10 +79,29 @@

 };

 Type l_uint64 = {

+	.letter = L_UINT64,

 	.size = 8,

 	.align = 8,

 	.c_int = 1,

 };

+

+

+static void

+prnode(Node *np)

+{

+	if (np->left)

+		prnode(np->left);

+	if (np->right)

+		prnode(np->right);

+	fprintf(stderr, "\t%c%c", np->op, np->type->letter);

+}

+

+void

+prtree(Node *np)

+{

+	prnode(np);

+	putc('\n', stderr);

+}

 void

 apply(Node *list[], void (*fun)(Node *))