[committed] libstdc++: Remove TODO comment

[Jonathan Wakely <jwakely@redhat.com>]

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We have a comment saying to replace the simple binary_semaphore type
with std::binary_semaphore, which has been done. However, that isn't
defined on all targets. So keep the simple one here that just implements
the parts of the API needed by <stop_token>, and remove the comment
suggesting it should be replaced.

libstdc++-v3/ChangeLog:

	* include/std/stop_token: Remove TODO comment.

Tested powerpc64le-linux. Committed to trunk.


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commit 151154a21da8b0784894b2463a117f4e283d5525
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon May 10 21:06:22 2021

    libstdc++: Remove TODO comment
    
    We have a comment saying to replace the simple binary_semaphore type
    with std::binary_semaphore, which has been done. However, that isn't
    defined on all targets. So keep the simple one here that just implements
    the parts of the API needed by <stop_token>, and remove the comment
    suggesting it should be replaced.
    
    libstdc++-v3/ChangeLog:
    
            * include/std/stop_token: Remove TODO comment.

diff --git a/libstdc++-v3/include/std/stop_token b/libstdc++-v3/include/std/stop_token
index fffc215d2a8..d0cfcf31097 100644
--- a/libstdc++-v3/include/std/stop_token
+++ b/libstdc++-v3/include/std/stop_token
@@ -107,7 +107,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 
 #ifndef __cpp_lib_semaphore
-    // TODO: replace this with a real implementation of std::binary_semaphore
     struct binary_semaphore
     {
       explicit binary_semaphore(int __d) : _M_counter(__d > 0) { }