malloc_allocator.h: Fixed the construct function to call global placement new instead...

malloc_allocator.h: Fixed the construct function to call global placement new instead of assignment.

2004-03-24  Dhruv Matani  <dhruvbird@gmx.net>

	* ext/malloc_allocator.h: Fixed the construct function to call
	global placement new instead of assignment. Added a check after
	the return from malloc to check whether returned pointer is NULL,
	and if so, throw std::bad_alloc().
	* ext/debug_allocator.h: Added a check in the deallocate function
	to check whether the user has passed a NULL pointer or not.

From-SVN: r79934