Perform on-entry propagation after range_of_stmt on a gcond.

Perform on-entry propagation after range_of_stmt on a gcond.

Propagation is automatically done by the temporal cache when defs are
out of date from the names on the RHS, but a gcond has no LHS, and any
updates on the RHS are never propagated.  Always propagate them.

	gcc/
	PR tree-optimization/102983
	* gimple-range-cache.h (propagate_updated_value): Make public.
	* gimple-range.cc (gimple_ranger::range_of_stmt): Propagate exports
	when processing gcond stmts.

	gcc/testsuite/
	* gcc.dg/pr102983.c: New.