path solver: Compute all PHI ranges simultaneously.

path solver: Compute all PHI ranges simultaneously.

PHIs must be resolved simulatenously, otherwise we may not pick up the
ranges incoming to the block.

For example.  If we put p3_7 in the cache before all PHIs have been
computed, we will pick up the wrong p3_7 value for p2_17:

    # p3_7 = PHI <1(2), 0(5)>
    # p2_17 = PHI <1(2), p3_7(5)>

This patch delays updating the cache until all PHIs have been
analyzed.

gcc/ChangeLog:

	PR tree-optimization/103222
	* gimple-range-path.cc (path_range_query::compute_ranges_in_phis):
	New.
	(path_range_query::compute_ranges_in_block): Call
	compute_ranges_in_phis.
	* gimple-range-path.h (path_range_query::compute_ranges_in_phis):
	New.

gcc/testsuite/ChangeLog:

	* gcc.dg/pr103222.c: New test.