Yet another debug check for unordered containers

[François Dumont]

Hi

     Here is another check on the max load factor.

2012-10-18  François Dumont  <fdumont@gcc.gnu.org>

     * include/debug/formatter.h (_Debug_msg_id): Add
     __msg_valid_load_factor.
     * include/debug/macros.h (__glibcxx_check_max_load_factor): New.
     * include/debug/unordered_set
     (unordered_set<>::max_load_factor(float)): Check max load factor
     is positive.
     (unordered_multiset<>::max_load_factor(float)): Likewise.
     * include/debug/unordered_map
     (unordered_map<>::max_load_factor(float)): Likewise.
     (unordered_multimap<>::max_load_factor(float)): Likewise.
     * testsuite/23_containers/unordered_map/debug/max_load_factor_neg.cc:
     New.
     * testsuite/23_containers/unordered_multimap/debug/
     max_load_factor_neg.cc: New.
     * testsuite/23_containers/unordered_set/debug/max_load_factor_neg.cc:
     New.
     * testsuite/23_containers/unordered_multiset/debug/
     max_load_factor_neg.cc: New.

Tested under Linux x86_64.

Ok to commit ?

François

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