libstdc++: more __intN tweaks

[Jonathan Wakely]

On 22/07/15 22:26 -0400, DJ Delorie wrote:
>
>Another place where a list of "all" types are explicitly listed, and
>the __intN types need to be included, and elsewhere protection against
>errors [-Wnarrowing] on targets that have small size_t.  Ok?
>
>	* include/bits/functional_hash.h: Add specializations for __intN
>	types.
>
>	* include/ext/pb_ds/detail/thin_heap_/thin_heap_.hpp (__gnu_pbds):
>	Guard against values that might exceed size_t's precision.

Yes, OK - thanks.