Fix Debug DR2354

[François Dumont]

Hi

 Â  I plan to apply attached patch tomorrow to fix those _GLIBCXX_DEBUG 
failures:

FAIL: 23_containers/map/modifiers/insert/dr2354.cc (test for excess errors)
FAIL: 23_containers/multimap/modifiers/insert/dr2354.cc (test for excess errors)
FAIL: 23_containers/unordered_map/insert/dr2354.cc (test for excess errors)
FAIL: 23_containers/unordered_multimap/insert/dr2354.cc (test for excess errors)

   I am also adding tests checking additional DR 2354 insert overloads. I discovered I needed to add those only because I looked at the ChangeLog entry.

 Â  Tested under Linux x86_64 Debug mode.

François


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