Duplicate the range information of the phi onto the new ssa_name

Since match_simplify_replacement uses gimple_simplify, there is a new
ssa name created sometimes and then we go and replace the phi edge with
this new ssa name, the range information on the phi is lost.
Placing this in replace_phi_edge_with_variable is the best option instead
of doing it in each time replace_phi_edge_with_variable is called which is
what is done today.

OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

gcc/ChangeLog:

	* tree-ssa-phiopt.c (replace_phi_edge_with_variable): Duplicate range
	info if we're the only things setting the target PHI.
	(value_replacement): Don't duplicate range here.
	(minmax_replacement): Likewise.

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