Remove the -resilience-bypass flag and functionality.

LLDB no longer depends on it.

rdar://problem/48018240

lib/Frontend/CompilerInvocation.cpp

@@ -1082,10 +1082,6 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
     Opts.EnableReflectionNames = false;
   }
 
-  if (Args.hasArg(OPT_enable_resilience_bypass)) {
-    Opts.EnableResilienceBypass = true;
-  }
-
   if (Args.hasArg(OPT_force_public_linkage)) {
     Opts.ForcePublicLinkage = true;
   }