Avoid static destruction order issues with quick_allocator.

[SVN r58275]

include/boost/smart_ptr/detail/quick_allocator.hpp

@@ -74,8 +74,9 @@ template<unsigned size, unsigned align_> struct allocator_impl
 
     static lightweight_mutex & mutex()
     {
-        static lightweight_mutex m;
-        return m;
+        static freeblock< sizeof( lightweight_mutex ), boost::alignment_of< lightweight_mutex >::value > fbm;
+        static lightweight_mutex * pm = new( &fbm ) lightweight_mutex;
+        return *pm;
     }
 
     static lightweight_mutex * mutex_init;