This isn't quite a 100% clean sweep of IWYU.
There are some false positives where clang fails.
Additionally there are still a few missed in the frontend side of things
that I didn't get to
I saw a red herring that I thought the high cpu usage in steamwebhelper could come from signal handlers.
This turned out to not be the case, but now I've got this implemented.
Installs the few signal handlers that we need upfront but for everything that isn't a mandatory signal
we instead now wait until the guest also installs that signal handler.
This fixes#1107
C++ no-op functions can't optimize out the predicate arguments in all cases.
This was causing a problem where zero cost assertions weren't actually zero cost.
The only way to resolve this is to actually use macros sadly enough.
This will give a fairly hefty performance uplift with anything operating on IR.
Patch moves HandleSIGSEGV in HostFactory.cpp to a non-frontend host signal handler, then registers its own frontend signal handler to catch unhandled segfaults.
Ryan Houdek