tree-optimization/114855 - more update_ssa speedup

The following tackles another source of slow bitmap operations,
namely populating blocks_to_update.  We already have that in
tree view around PHI insertion but also the initial population is
slow.  There's unfortunately a conditional inbetween list view
requirement and the bitmap API doesn't allow opportunistic
switching but rejects tree -> tree or list -> list transitions.
So the following patch wraps the early population in a tree view
section with possibly one redundant tree -> list -> tree view
transition.

This cuts tree SSA incremental from 228.25s (21%) to 65.05s (7%).

	PR tree-optimization/114855
	* tree-into-ssa.cc (update_ssa): Use tree view for the
	initial population of blocks_to_update.

0 files changed, 0 insertions, 0 deletions