The coroutine_handle<void>::from_address(void*) version is already
noexcept, and they do the same thing. Make them consistent.

libstdc++-v3/ChangeLog:

        PR libstdc++/99021
        * include/std/coroutine (coroutine_handle<P>::from_address): Add
        noexcept.

Tested x86_64-linux. Committed to trunk.

commit 26a3f288f1895a8c061c0458590542a3d2ee796a
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Tue Feb 9 11:23:29 2021

    libstdc++: Make coroutine_handle<_Promise>::from_address() noexcept [PR 
99021]
    
    The coroutine_handle<void>::from_address(void*) version is already
    noexcept, and they do the same thing. Make them consistent.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/99021
            * include/std/coroutine (coroutine_handle<P>::from_address): Add
            noexcept.

diff --git a/libstdc++-v3/include/std/coroutine 
b/libstdc++-v3/include/std/coroutine
index e69024caf4c..209deb7bb42 100644
--- a/libstdc++-v3/include/std/coroutine
+++ b/libstdc++-v3/include/std/coroutine
@@ -206,7 +206,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       constexpr void* address() const noexcept { return _M_fr_ptr; }
 
-      constexpr static coroutine_handle from_address(void* __a)
+      constexpr static coroutine_handle from_address(void* __a) noexcept
       {
        coroutine_handle __self;
        __self._M_fr_ptr = __a;

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