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cc2/qbe: Don't load addresses generated

When an address is generated as part of a decay, or
as part of the & operator we do not have to generate
any code, because in that case we are only interested
in the memory location.

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

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

@@ -13,6 +13,7 @@

 	INITF   =     1 << 7,  /* initializer flag */

 	ELLIPS  =     1 << 8,  /* vararg function */

 	ARRF    =     1 << 9,  /* array flag */

+	PTRF    =     1 << 10, /* pointer flag */

 };

 enum sclass {

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

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

@@ -170,7 +170,7 @@

 	Node *new;

 	int flags = tp->flags;

-	if (flags & (AGGRF|FUNF|ARRF))

+	if (flags & (AGGRF|FUNF|ARRF|PTRF))

 		return np;

 	switch (tp->size) {

@@ -667,6 +667,7 @@

 	case OADDR:

 		l = lhs(l);

 		l->type = *tp;

+		l->type.flags |= PTRF;

 		return l;

 	case OFIELD:

 		return field(np, 0);