IR: implement some missing features in wrapped descriptors for JVM IR

Wrapped descriptors are still used in reporting of the "conflicting JVM
signatures" diagnostic in the JVM IR backend, and TODOs in
implementations prevent that diagnostic from being shown, obscuring even
the place where the error happens.

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/WrappedDescriptors.kt

@@ -132,7 +132,7 @@ abstract class WrappedCallableDescriptor<T : IrDeclaration>(
         TODO("not implemented")
     }
 
-    override fun getValueParameters(): MutableList<ValueParameterDescriptor> {
+    override fun getValueParameters(): List<ValueParameterDescriptor> {
         TODO("not implemented")
     }
 
@@ -185,6 +185,8 @@ open class WrappedValueParameterDescriptor(
 
 
     override fun getOverriddenDescriptors(): Collection<ValueParameterDescriptor> = emptyList()
+    override fun getTypeParameters(): List<TypeParameterDescriptor> = emptyList()
+    override fun getValueParameters(): List<ValueParameterDescriptor> = emptyList()
 
     override fun getOriginal() = this
 
@@ -423,10 +425,6 @@ open class WrappedSimpleFunctionDescriptor(
         if (owner.origin == IrDeclarationOrigin.FAKE_OVERRIDE) CallableMemberDescriptor.Kind.FAKE_OVERRIDE
         else CallableMemberDescriptor.Kind.SYNTHESIZED
 
-    override fun isHiddenToOvercomeSignatureClash(): Boolean {
-        TODO("not implemented")
-    }
-
     override fun copy(
         newOwner: DeclarationDescriptor?,
         modality: Modality?,
@@ -437,11 +435,10 @@ open class WrappedSimpleFunctionDescriptor(
         TODO("not implemented")
     }
 
-    override fun isHiddenForResolutionEverywhereBesideSupercalls(): Boolean {
+    override fun isHiddenToOvercomeSignatureClash(): Boolean = false
-        TODO("not implemented")
+    override fun isHiddenForResolutionEverywhereBesideSupercalls(): Boolean = false
-    }
 
-    override fun getInitialSignatureDescriptor() = null
+    override fun getInitialSignatureDescriptor(): FunctionDescriptor? = null
 
     override fun <V : Any?> getUserData(key: CallableDescriptor.UserDataKey<V>?): V? = null