hg: jdk/jdk: 8219922: Simplify and optimize IndexSetIterator::next using count_trailing_zeros

[claes.redestad at oracle.com]

Changeset: e5b461681b88
Author:    redestad
Date:      2019-02-28 22:11 +0100
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/e5b461681b88

8219922: Simplify and optimize IndexSetIterator::next using count_trailing_zeros
Reviewed-by: kvn, neliasso

! src/hotspot/share/opto/indexSet.cpp
! src/hotspot/share/opto/indexSet.hpp