Eliminate block_iter_name_*

Eliminate block_iter_name_*

This patch gets rid of block_iter_name_* as being unnecessary.  It's
the same as calling block_iter_match_*, and passing strcmp_iw as
comparison routine.

(A later patch will get rid of those new explicit strcmp_iw calls.)

gdb/ChangeLog:
2017-07-20  Pedro Alves  <palves@redhat.com>

	* block.c (block_iter_name_step, block_iter_name_first)
	(block_iter_name_next): Delete.
	(block_lookup_symbol_primary): Adjust to use
	dict_iter_match_first/dict_iter_match_next.
	* block.h (block_iter_name_first, block_iter_name_next): Delete
	declarations.
	(ALL_BLOCK_SYMBOLS_WITH_NAME): Adjust to use
	dict_iter_match_first/dict_iter_match_next.