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Add isaggregate for later use with abi conformity.

--- a/6/asm.h

+++ b/6/asm.h

@@ -316,6 +316,7 @@

 size_t size(Node *n);

 ssize_t tyoffset(Type *ty, Node *memb);

 ssize_t offset(Node *aggr, Node *memb);

+int isaggregate(Type *t);

 int stacknode(Node *n);

 int floatnode(Node *n);

 void breakhere();

--- a/6/typeinfo.c

+++ b/6/typeinfo.c

@@ -408,3 +408,10 @@

 	return tyoffset(exprtype(aggr), memb);

 }

+int

+isaggregate(Type *t)

+{

+	t = tybase(t);

+	return (t->type == Tystruct || t->type == Tyarray || t->type == Tytuple ||

+		(t->type == Tyunion && !isenum(t)));

+}