[gcc r12-4064] libstdc++: Add noexcept to common_iterator proxy operators

[Jonathan Wakely]

https://gcc.gnu.org/g:ce709ad3dc0ed5d7ea48a116311d4441225446f0

commit r12-4064-gce709ad3dc0ed5d7ea48a116311d4441225446f0
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Apr 30 14:43:54 2021 +0100

    libstdc++: Add noexcept to common_iterator proxy operators
    
    Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/stl_iterator.h (common_iterator::__arrow_proxy)
            (common_iterator::__postfix_proxy): Add noexcept.

Diff:
---
 libstdc++-v3/include/bits/stl_iterator.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/bits/stl_iterator.h b/libstdc++-v3/include/bits/stl_iterator.h
index 4973f792b56..8517652a173 100644
--- a/libstdc++-v3/include/bits/stl_iterator.h
+++ b/libstdc++-v3/include/bits/stl_iterator.h
@@ -1813,7 +1813,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
     public:
       const iter_value_t<_It>*
-      operator->() const
+      operator->() const noexcept
       { return std::__addressof(_M_keep); }
     };
 
@@ -1828,7 +1828,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
     public:
       const iter_value_t<_It>&
-      operator*() const
+      operator*() const noexcept
       { return _M_keep; }
     };