Redesign jump threading profile updates to avoid introducing insanities.

Redesign jump threading profile updates to avoid introducing insanities.

gcc:

2014-09-30  Teresa Johnson  <tejohnson@google.com>

	* tree-ssa-threadupdate.c (struct ssa_local_info_t): New
	duplicate_blocks bitmap.
	(remove_ctrl_stmt_and_useless_edges): Ditto.
	(create_block_for_threading): Ditto.
	(compute_path_counts): New function.
	(update_profile): Ditto.
	(recompute_probabilities): Ditto.
	(update_joiner_offpath_counts): Ditto.
	(freqs_to_counts_path): Ditto.
	(clear_counts_path): Ditto.
	(ssa_fix_duplicate_block_edges): Update profile info.
	(ssa_create_duplicates): Pass new parameter.
	(ssa_redirect_edges): Remove old profile update.
	(thread_block_1): New duplicate_blocks bitmap,
	remove old profile update.
	(thread_single_edge): Pass new parameter.

gcc/testsuite:

2014-09-30  Teresa Johnson  <tejohnson@google.com>

	* testsuite/gcc.dg/tree-prof/20050826-2.c: New test.
	* testsuite/gcc.dg/tree-prof/cmpsf-1.c: Ditto.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@215739 138bc75d-0d04-0410-961f-82ee72b054a4