[sil-opt] Actually pass down IRGenOptions to irgen::createIRGenModule().

Otherwise the options from our invocation that we specialized in sil-opt's main
function will not take effect.

Author: gottesmm

include/swift/IRGen/IRGenPublic.h

@@ -31,7 +31,7 @@ class IRGenModule;
 std::pair<IRGenerator *, IRGenModule *>
 createIRGenModule(SILModule *SILMod, StringRef OutputFilename,
                   StringRef MainInputFilenameForDebugInfo,
-                  StringRef PrivateDiscriminator);
+                  StringRef PrivateDiscriminator, IRGenOptions &options);
 
 /// Delete the IRGenModule and IRGenerator obtained by the above call.
 void deleteIRGenModule(std::pair<IRGenerator *, IRGenModule *> &Module);

lib/IRGen/IRGen.cpp

@@ -937,9 +937,8 @@ static void initLLVMModule(const IRGenModule &IGM, SILModule &SIL) {
 std::pair<IRGenerator *, IRGenModule *>
 swift::irgen::createIRGenModule(SILModule *SILMod, StringRef OutputFilename,
                                 StringRef MainInputFilenameForDebugInfo,
-                                StringRef PrivateDiscriminator) {
-
-  IRGenOptions Opts;
+                                StringRef PrivateDiscriminator,
+                                IRGenOptions &Opts) {
   IRGenerator *irgen = new IRGenerator(Opts, *SILMod);
   auto targetMachine = irgen->createTargetMachine();
   if (!targetMachine)

tools/sil-opt/SILOpt.cpp

@@ -784,7 +784,8 @@ int main(int argc, char **argv) {
   case OptGroup::Unknown: {
     auto T = irgen::createIRGenModule(
         SILMod.get(), Invocation.getOutputFilenameForAtMostOnePrimary(),
-        Invocation.getMainInputFilenameForDebugInfoForAtMostOnePrimary(), "");
+        Invocation.getMainInputFilenameForDebugInfoForAtMostOnePrimary(), "",
+        IRGenOpts);
     runCommandLineSelectedPasses(SILMod.get(), T.second);
     irgen::deleteIRGenModule(T);
     break;