We don't display the stack frame for ##isNoInjection()## functions, but the backtrace does set the previous call lines wrong.
This came up when I made the Closure::__invoke to be hidden, but the line numbers were wrong.
This change is mostly for FB internal organizational reasons.
Building is not effected beyond the fact that the target now
lands in hphp/hhvm/hhvm rather than src/hhvm/hhvm.