Enabled IRGen testcases to enable UseJIT, which

is typically disabled when compiling normally,
and thereby emit and check for class initialization
without interfering with PlaygroundTransform
testcases that use classes.


Swift SVN r20659

lib/Frontend/CompilerInvocation.cpp

@@ -871,6 +871,9 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
 
   if (Args.hasArg(OPT_playground))
     Opts.Playground = true;
+
+  if (Args.hasArg(OPT_use_jit))
+    Opts.UseJIT = true;
   
   return false;
 }