[PATCH] Fix PR c++/30044

[Jason Merrill]

On 06/15/2015 02:32 PM, Patrick Palka wrote:
> On Mon, Jun 15, 2015 at 2:05 PM, Jason Merrill <jason@redhat.com> wrote:
>> Any reason not to use grow_tree_vec?
>
> Doing so causes a lot of ICEs in the testsuite.  I think it's because
> grow_tree_vec invalidates the older parameter_vec which some trees may
> still be holding a reference to in their DECL_TEMPLATE_PARMS field.

Hmm, that's unfortunate, as doing it this way means we get a bunch of 
garbage TREE_VECs in the process.  But I guess the patch is OK as is.

Jason