PATCH RFA: Handle erasing a reference to an entry in a hash table

[Ian Lance Taylor]

PR 25896 is about a problem when passing a reference to an entry in a
hash table to the erase function.  The issue was fixed in the TR1
classes unordered_map and friends.  This patch extends the fix to
hash_map and friends.

Tested by building libstdc++-v3 and running the C++ and libstdc++-v3
testsuite on i686-pc-linux-gnu.  The patch includes a couple of tests
copied from the tests included with the fix for PR 25896.

OK to commit?

Ian


2009-03-30  Ian Lance Taylor  <iant@google.com>

	* include/backward/hashtable.h (erase): Correctly handle erasing a
	reference to an entry in the hash table.
	* testsuite/backward/hash_map/25896.cc: New.
	* testsuite/backward/hash_set/25896.cc: New.


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