Patch committed: Fix erasing with reference in old hashtable code

[Ian Lance Taylor]

This patch fixes a problem with the old hashtable::erase code when the
caller passes a reference to an element in the table, the element is not
the first in the bucket, but it is equal to the first in the bucket.
This is PR 49060, and the patch and test case are from that PR with
minor tweaks.  Bootstrapped and ran libstdc++ testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian


2011-05-25  David Tardon  <dtardon@redhat.com>

	PR libstdc++/49060
	* include/backward/hashtable.h (hashtable::erase): Don't crash if
	erasing first and another element with a reference to the other
	element.
	* testsuite/backward/hash_set/49060.cc: New.


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