Fix ipa-vrp convert value_range

Fix ipa-vrp convert value_range

gcc/ChangeLog:

2016-09-27  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR ipa/77677
	* ipa-prop.c (ipa_compute_jump_functions_for_edge): Use
	extract_range_from_unary_expr to convert value_range.
	* tree-vrp.c (extract_range_from_unary_expr_1): Rename to.
	(extract_range_from_unary_expr): This.
	* tree-vrp.h (extract_range_from_unary_expr): Declare.

gcc/testsuite/ChangeLog:

2016-09-27  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR ipa/77677
	* gcc.dg/torture/pr77677-2.c: New test.

From-SVN: r240517