NTRegistry - added wow64 redirection support.

TESTS=chrome_elf_unittests: NtRegistryTest*
BUG=641169
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win10_chromium_x64_rel_ng

Review-Url: https://codereview.chromium.org/2345913003
Cr-Commit-Position: refs/heads/master@{#422919}
12 files changed