ARM64: Enable low level profiling.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/353643003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21965 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Don't list platform-posix.cc twice on android

BUG=387326
R=marja@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/350893002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21967 ce2b1a6d-e550-0410-aec6-3dcde31c8c00