cotire 1.6.6

Summary: Closes https://github.com/facebook/hhvm/pull/3817

Reviewed By: @ptarjan

Differential Revision: D1569826
Fix SplFileInfo::setFile/InfoClass

Summary: Use infoClass and not fileClass everywhere
Also throw proper exceptions

This fixes an issue in zf2 (most likely)
Closes https://github.com/facebook/hhvm/pull/3814

Reviewed By: @ptarjan

Differential Revision: D1569299
SSA for GetCtxFwdCall and GetCtxFwdCallDyn

Reviewed By: @alexmalyshev

Differential Revision: D1568547