gcc/ChangeLog:

	* tree-vrp.c (simplify_switch_using_ranges): Try to truncate
	the case label ranges that partially overlap with OP's value
	range.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/vrp107.c: New test.
	* gcc.dg/tree-ssa/vrp108.c: New test.
	* gcc.dg/tree-ssa/vrp109.c: New test.

From-SVN: r239157