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[cc2-qbe] Do not copy meaningless flags in tmpnode()

These flags can create problems in some places, for example
with arguments:

	int f(unsigned long l) { return l; }

the returned value is included in the list of arguments.

--- a/cc2/arch/qbe/cgen.c

+++ b/cc2/arch/qbe/cgen.c

@@ -98,6 +98,7 @@

 static Node *

 tmpnode(Node *np, Type *tp)

 {

+	char flags;

 	Symbol *sym;

 	if (!np)

@@ -104,6 +105,8 @@

 		np = newnode(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;