* ggc-common.c [!ENABLE_VALGRIND_CHECKING] (VALGRIND_DISCARD):
	Define as empty.
	(ggc_realloc): Update valgrind annotations.
	* ggc-page.c [!ENABLE_VALGRIND_CHECKING] (VALGRIND_DISCARD):
	Define as empty.
 	(alloc_anon, free_page, ggc_alloc, poison_pages): Add machinery to
	valgrind-annotate memory.

From-SVN: r59310