IRGen: revert hack to look for specialized deinits

Author: eeckstein

lib/IRGen/GenType.cpp

@@ -26,7 +26,6 @@
 #include "swift/Basic/Platform.h"
 #include "swift/Basic/SourceManager.h"
 #include "swift/IRGen/Linking.h"
-#include "swift/SIL/GenericSpecializationMangler.h"
 #include "swift/SIL/SILModule.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/ADT/SmallString.h"
@@ -2938,34 +2937,20 @@ static bool tryEmitDeinitCall(IRGenFunction &IGF,
     return true;
   }
 
-  auto deinitSILFn = deinitTable->getImplementation();
-
-  // Look for a specialization of deinit that we can call.
-  auto substitutions = ty->getContextSubstitutionMap();
-  if (!substitutions.empty() &&
-      !substitutions.getRecursiveProperties().hasArchetype()) {
-    Mangle::GenericSpecializationMangler mangler(
-        deinitSILFn->getASTContext(), deinitSILFn,
-        deinitSILFn->getSerializedKind());
-
-    auto specializedName = mangler.mangleReabstracted(
-        substitutions, /*needAlternativeMangling=*/false);
-    auto specializedFn = IGF.IGM.getSILModule().lookUpFunction(specializedName);
-    if (specializedFn)
-      deinitSILFn = specializedFn;
-  }
-
   // The deinit should take a single value parameter of the nominal type, either
   // by @owned or indirect @in convention.
-  auto deinitFn = IGF.IGM.getAddrOfSILFunction(deinitSILFn, NotForDefinition);
-  auto deinitTy = deinitSILFn->getLoweredFunctionType();
+  auto deinitFn = IGF.IGM.getAddrOfSILFunction(deinitTable->getImplementation(),
+                                               NotForDefinition);
+  auto deinitTy = deinitTable->getImplementation()->getLoweredFunctionType();
   auto deinitFP = FunctionPointer::forDirect(IGF.IGM, deinitFn,
                                              nullptr, deinitTy);
   assert(deinitTy->getNumParameters() == 1
          && deinitTy->getNumResults() == 0
          && !deinitTy->hasError()
          && "deinit should have only one parameter");
 
+  auto substitutions = ty->getContextSubstitutionMap();
+                                                     
   CalleeInfo info(deinitTy,
                   deinitTy->substGenericArgs(IGF.getSILModule(),
                                      substitutions,