[PATCH] Implement LWG 3062, Unnecessary decay_t in is_execution_policy_v

[Jonathan Wakely]

On 25/04/19 11:51 -0700, Thomas Rodgers wrote:
>Revised patch.
>

>From 074685cf74b48604244c0c6f1d8cba63ff8915e5 Mon Sep 17 00:00:00 2001
>From: Thomas Rodgers <trodgers@redhat.com>
>Date: Wed, 24 Apr 2019 15:53:45 -0700
>Subject: [PATCH] Implement LWG 3062, Unnecessary decay_t in
> is_execution_policy_v
>
>	should be remove_cvref_t
>	* include/pstl/execution_defs.h (__enable_if_execution_policy):
>        Use std::__remove_cv_ref_t when building with GCC.

OK for trunk (but not for gcc-9-branch). Thanks.