path solver: Compute ranges in path in gimple order.

path solver: Compute ranges in path in gimple order.

Andrew's patch for this PR103254 papered over some underlying
performance issues in the path solver that I'd like to address.

We are currently solving the SSA's defined in the current block in
bitmap order, which amounts to random order for all purposes.  This is
causing unnecessary recursion in gori.  This patch changes the order
to gimple order, thus solving dependencies before uses.

There is no change in threadable paths with this change.

Tested on x86-64 & ppc64le Linux.

gcc/ChangeLog:

	PR tree-optimization/103254
	* gimple-range-path.cc (path_range_query::compute_ranges_defined): New
	(path_range_query::compute_ranges_in_block): Move to
	compute_ranges_defined.
	* gimple-range-path.h (compute_ranges_defined): New.