Remove workarounds for LLVM bug 33220

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/CodeGenerator.kt

@@ -713,9 +713,7 @@ internal class FunctionGenerationContext(val function: LLVMValueRef,
 
     private val needSlots: Boolean
         get() {
-            return slotCount > frameOverlaySlotCount || localAllocs > 0 ||
-                    // Prevent empty cleanup on mingw to workaround LLVM bug:
-                    context.config.targetManager.target == KonanTarget.MINGW
+            return slotCount > frameOverlaySlotCount || localAllocs > 0
         }
 
     private fun releaseVars() {

runtime/src/main/cpp/Exceptions.cpp

@@ -170,12 +170,6 @@ void ThrowException(KRef exception) {
   PrintThrowable(exception);
   RuntimeAssert(false, "Exceptions unsupported");
 #else
-#if (__MINGW32__ || __MINGW64__)
-  // Workaround for https://bugs.llvm.org/show_bug.cgi?id=33220
-  // This code forces the function to have at least one landingpad:
-  ObjHolder toBeDestructed(exception);
-#endif
-
   throw ObjHolder(exception);
 #endif
 }