Do not continue propagating values which cannot be set properly.

Do not continue propagating values which cannot be set properly.

If the on-entry cache cannot properly represent a range, do not continue
trying to propagate it.

	PR tree-optimization/101148
	PR tree-optimization/101014
	* gimple-range-cache.cc (ranger_cache::ranger_cache): Adjust.
	(ranger_cache::~ranger_cache): Adjust.
	(ranger_cache::block_range): Check if propagation disallowed.
	(ranger_cache::propagate_cache): Disallow propagation if new value
	can't be stored properly.
	* gimple-range-cache.h (ranger_cache::m_propfail): New member.