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cc2: Add array flag

When an array is loaded we have to do nothing, because an array
is loaded using only its address (like it was already donde for
aggregates).

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

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

@@ -12,6 +12,7 @@

 	PARF    =     1 << 6,  /* parameter */

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

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

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

 };

 enum sclass {

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

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

@@ -571,6 +571,7 @@

 	size = pop();

 	base = pop();

 	tp = pop();

+	tp->flags = ARRF;

 	tp->size = size->u.i * base->size; /* FIXME check for overflow */

 	tp->align = base->align;

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

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

@@ -102,7 +102,7 @@

 	Node *new;

 	int flags = tp->flags;

-	if (flags & (AGGRF|FUNF))

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

 		return np;

 	switch (tp->size) {