[patch] Add exception specs to allocator equality operators

[Jonathan Wakely]

The equality operators for std::allocator were throw() in C++03 and
are noexcept in C++11, but we were missing those specs (and the
problem wasn't caught by the testsuite because of PR50871).

Tested x86_64-linux, committed to trunk.
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commit 3043f742f7f31504dd881b55eaf6abaf73d79380
Author: Jonathan Wakely <accu@kayari.org>
Date:   Mon Apr 14 15:55:34 2014 +0100

    	* include/bits/allocator.h (operator==, operator!=): Add exception
    	specifications.

diff --git a/libstdc++-v3/include/bits/allocator.h b/libstdc++-v3/include/bits/allocator.h
index e293c54..05a06ba 100644
--- a/libstdc++-v3/include/bits/allocator.h
+++ b/libstdc++-v3/include/bits/allocator.h
@@ -126,21 +126,25 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _T1, typename _T2>
     inline bool
     operator==(const allocator<_T1>&, const allocator<_T2>&)
+    _GLIBCXX_USE_NOEXCEPT
     { return true; }
 
   template<typename _Tp>
     inline bool
     operator==(const allocator<_Tp>&, const allocator<_Tp>&)
+    _GLIBCXX_USE_NOEXCEPT
     { return true; }
 
   template<typename _T1, typename _T2>
     inline bool
     operator!=(const allocator<_T1>&, const allocator<_T2>&)
+    _GLIBCXX_USE_NOEXCEPT
     { return false; }
 
   template<typename _Tp>
     inline bool
     operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
+    _GLIBCXX_USE_NOEXCEPT
     { return false; }
 
   /// @} group allocator