Remove logic handling `Exception::$trace` as a resource
Summary: Since
D27932342 (https://github.com/facebook/hhvm/commit/
db41a60799b5289ae30a0b49c7a98287f23ab548) we stopped initializing `Exception::$trace` with a resource. This change was originally landed with
D28258675 (https://github.com/facebook/hhvm/commit/
2db11bef67ef092016179f655e3bd5b692e1621b), but got reverted in
D28258675 (https://github.com/facebook/hhvm/commit/
2db11bef67ef092016179f655e3bd5b692e1621b), caught in the crossfire of removing the compact backtrace optimization.
Reviewed By: ricklavoie
Differential Revision:
D36530155
fbshipit-source-id:
105fa3f3a14b7365adb7d8a228378ae081d1687d