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cc2: Move tmpnode() to generic code

Tmpnode() is a generic function and it can be used in different
targets.

--- a/src/cmd/cc/cc2/cc2.h

+++ b/src/cmd/cc/cc2/cc2.h

@@ -229,6 +229,7 @@

 extern void setlabel(Symbol *sym), getbblocks(void);

 extern Node *label2node(Node *np, Symbol *sym);

 extern Node *constnode(Node *np, TUINT n, Type *tp);

+extern Node *tmpnode(Node *, Type *);

 extern Symbol *newlabel(void);

 extern void pprint(char *s);

--- a/src/cmd/cc/cc2/code.c

+++ b/src/cmd/cc/cc2/code.c

@@ -135,6 +135,25 @@

 }

 Node *

+tmpnode(Node *np, Type *tp)

+{

+	char flags;

+	Symbol *sym;

+

+	if (!np)

+		np = node(OTMP);

+	sym = getsym(TMPSYM);

+	sym->type = np->type = *tp;

+	flags = tp->flags & ~(PARF|INITF);

+	sym->type.flags = np->type.flags = flags;

+	sym->kind = STMP;

+	np->left = np->right = NULL;

+	np->u.sym = sym;

+	np->op = OTMP;

+	return np;

+}

+

+Node *

 constnode(Node *np, TUINT n, Type *tp)

 {

 	if (!np)

--- a/src/cmd/cc/cc2/target/qbe/cgen.c

+++ b/src/cmd/cc/cc2/target/qbe/cgen.c

@@ -7,11 +7,6 @@

 #include "arch.h"

 #include "../../cc2.h"

-enum sflags {

-	ISTMP  = 1,

-	ISCONS = 2

-};

-

 static char opasmw[] = {

 	[OADD] = ASADDW,

 	[OSUB] = ASSUBW,

@@ -76,26 +71,6 @@

 };

 extern Type int32type, uint32type, ptrtype;

-

-static Node *

-tmpnode(Node *np, Type *tp)

-{

-	char flags;

-	Symbol *sym;

-

-	if (!np)

-		np = node(OTMP);

-	sym = getsym(TMPSYM);

-	sym->type = np->type = *tp;

-	flags = tp->flags & ~(PARF|INITF);

-	sym->type.flags = np->type.flags = flags;

-	sym->kind = STMP;

-	np->left = np->right = NULL;

-	np->u.sym = sym;

-	np->op = OTMP;

-	np->flags |= ISTMP;

-	return np;

-}

 static Node *

 complex(Node *np)