* alloc-pool.c (hash_descriptor, eq_descriptor,
	alloc_pool_descriptor): Fix -Wc++-compat warnings.
	* bitmap.c (hash_descriptor, eq_descriptor, bitmap_descriptor):
	Likewise.
	* ggc-common.c (hash_descriptor, eq_descriptor, hash_ptr, eq_ptr,
	loc_descriptor, ggc_prune_ptr, ggc_free_overhead,
	final_cmp_statistic, cmp_statistic, dump_ggc_loc_statistics):
	Likewise.
	* varray.c (hash_descriptor, eq_descriptor, varray_descriptor):
	Likewise.

From-SVN: r137446