Bug 190758 re-enabled LTO for Production builds for x86-family CPUs. Enabling it for ARM was left out due to a compiler issue. That issue has been fixed, and so now we can re-enable LTO for ARM.
<rdar://49190767>
Created attachment 390121 [details] Patch
Note that there are important steps to take when updating ANGLE. See http://trac.webkit.org/wiki/UpdatingANGLE
Comment on attachment 390121 [details] Patch Clearing flags on attachment: 390121 Committed r256108: <https://trac.webkit.org/changeset/256108>
All reviewed patches have been landed. Closing bug.