IRGen: remove unused method (NFCI)

This function is not used anywhere in the compiler or runtime, so remove
it.

Author: compnerd

lib/IRGen/GenValueWitness.cpp

@@ -1494,16 +1494,6 @@ getAddrOfKnownValueWitnessTable(IRGenModule &IGM, CanType type,
   return {};
 }
 
-llvm::Constant *
-IRGenModule::getAddrOfEffectiveValueWitnessTable(CanType concreteType,
-                                                 ConstantInit init) {
-  if (auto known =
-          getAddrOfKnownValueWitnessTable(*this, concreteType, false)) {
-    return known.getValue();
-  }
-  return getAddrOfValueWitnessTable(concreteType);
-}
-
 /// Emit a value-witness table for the given type.
 ConstantReference irgen::emitValueWitnessTable(IRGenModule &IGM,
                                              CanType abstractType,

lib/IRGen/IRGenModule.h

@@ -1676,9 +1676,6 @@ private:                                                                       \
                                         ForDefinition_t forDefinition);
   llvm::Constant *getAddrOfValueWitnessTable(CanType concreteType,
                                              ConstantInit init = ConstantInit());
-  llvm::Constant *
-  getAddrOfEffectiveValueWitnessTable(CanType concreteType,
-                                      ConstantInit init = ConstantInit());
   std::optional<llvm::Function *>
   getAddrOfIVarInitDestroy(ClassDecl *cd, bool isDestroyer, bool isForeign,
                            ForDefinition_t forDefinition);