Calculate size and alignment, and reuse memory for all variadic calls within a procedure body

src/checker.cpp

@@ -185,6 +185,8 @@ gb_internal void init_decl_info(DeclInfo *d, Scope *scope, DeclInfo *parent) {
 	ptr_set_init(&d->type_info_deps, 0);
 	d->labels.allocator = heap_allocator();
 	d->variadic_reuses.allocator = heap_allocator();
+	d->variadic_reuse_max_bytes = 0;
+	d->variadic_reuse_max_align = 1;
 }
 
 gb_internal DeclInfo *make_decl_info(Scope *scope, DeclInfo *parent) {