hg: jdk10/hs/hotspot: 8179004: Add an efficient implementation of the "count trailing zeros" operation

[kim.barrett at oracle.com]

Changeset: af249b711f38
Author:    kbarrett
Date:      2017-05-05 16:20 -0400
URL:       http://hg.openjdk.java.net/jdk10/hs/hotspot/rev/af249b711f38

8179004: Add an efficient implementation of the "count trailing zeros" operation
Summary: Added count_trailing_zeros function, with platform-dependent implementations.
Reviewed-by: dholmes, cjplummer

+ src/os_cpu/solaris_sparc/vm/count_trailing_zeros_solaris_sparc.hpp
+ src/os_cpu/solaris_x86/vm/count_trailing_zeros_solaris_x86.hpp
+ src/share/vm/utilities/count_trailing_zeros.hpp
+ test/native/utilities/test_count_trailing_zeros.cpp