[embedded] Don't remove functions from the zombie list in DropAllSIL

Author: kubamracek

lib/IRGen/GenDecl.cpp

@@ -2205,6 +2205,11 @@ void IRGenerator::emitObjCActorsNeedingSuperclassSwizzle() {
 /// from other modules. This happens e.g. if a public class contains a (dead)
 /// private method.
 void IRGenModule::emitVTableStubs() {
+  if (getSILModule().getOptions().DropAllSILAfterSerialization) {
+    // We're asked to emit an empty IR module
+    return;
+  }
+
   llvm::Function *stub = nullptr;
   for (auto I = getSILModule().zombies_begin();
            I != getSILModule().zombies_end(); ++I) {

lib/SILOptimizer/UtilityPasses/DropAllSILPass.cpp

@@ -44,7 +44,6 @@ class DropAllSILPass : public SILModuleTransform {
     for (SILFunction *F : FunctionsToErase) {
       notifyWillDeleteFunction(F);
       M.eraseFunction(F);
-      M.removeFromZombieList(F->getName());
     }
 
     for (SILGlobalVariable *G : GlobalsToErase) {