Port "Tighten ECDSA validation" change from openJdk8u121-b13

changeset:   12179:31dae74ad077
user:        igerasim
date:        Wed Nov 23 11:42:01 2016 +0300
summary:     8168714: Tighten ECDSA validation

Test: CtsLibcoreTestCases
Bug: 36461944
Change-Id: I0a6422967b325e2f2a0fb2b3b1548acf319d0f04
3 files changed