Use ipa-vrp result in tree-vrp

Use ipa-vrp result in tree-vrp

gcc/ChangeLog:

2016-09-21  Kugan Vivekanandarajah  <kuganv@linaro.org>

	 * tree-vrp.c (get_value_range): Teach PARM_DECL to use ipa-vrp
	 results.

gcc/testsuite/ChangeLog:

2016-09-21  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* gcc.dg/guality/pr54519-1.c: Add -fno-ipa-vrp. Else constant
	arguments/compare will be optimized away.
	* gcc.dg/torture/ftrapv-1.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@240293 138bc75d-0d04-0410-961f-82ee72b054a4