[gcc r11-4392] libstdc++: Fix error in experimental::strand

[Jonathan Wakely]

https://gcc.gnu.org/g:b784bbbe45414084551a824504650f21cb653ca1

commit r11-4392-gb784bbbe45414084551a824504650f21cb653ca1
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Oct 26 21:00:06 2020 +0000

    libstdc++: Fix error in experimental::strand
    
    libstdc++-v3/ChangeLog:
    
            * include/experimental/executor (strand::_State): Fix thinko.

Diff:
---
 libstdc++-v3/include/experimental/executor | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/experimental/executor b/libstdc++-v3/include/experimental/executor
index 45e813f6747..462a4b24b16 100644
--- a/libstdc++-v3/include/experimental/executor
+++ b/libstdc++-v3/include/experimental/executor
@@ -1602,8 +1602,8 @@ inline namespace v1
       {
 #if defined(_GLIBCXX_HAS_GTHREADS)
 	bool
-	running_in_this_thread() const
-	{ return std::this_thread::get_id() == _M_state->_M_running_on; }
+	running_in_this_thread() const noexcept
+	{ return std::this_thread::get_id() == _M_running_on; }
 
 	std::thread::id _M_running_on;
 #else