Don't use ANY PHI equivalences in range-on-entry.

Don't use ANY PHI equivalences in range-on-entry.

PR 108139 dissallows PHI equivalencies in the on-entry calculator, but
it was only checking if the equivlaence was a PHI.  In this case, NAME
itself is a PHI with an equivlaence caused by an undefined value, so we
also need to check that case.  Unfortunately this un-fixes 101912.

	PR tree-optimization/109462
	gcc/
	* gimple-range-cache.cc (ranger_cache::fill_block_cache): Don't
	check for equivalences if NAME is a phi node.

	gcc/testsuite/
	* gcc.dg/uninit-pr101912.c: XFAIL the warning.