* doc/tm.texi (MALLOC_ABI_ALIGNMENT): New macro.  Alignment, in bits,
	a C conformant malloc implementation has to provide.
	* defaults.h (MALLOC_ABI_ALIGNMENT): Default to BITS_PER_WORD.

	ada/
	* targtyps.c (get_target_default_allocator_alignment): Use it.

	testsuite/
	* gcc.dg/mallign.c: New test.
	* gnat.dg/allocator_maxalign1.adb: New test.
	* gnat.dg/test_allocator_maxalign2.adb: Main caller for ...
	* gnat.dg/allocator_maxalign2.ad[bs]: New test.

From-SVN: r137984