Minor. Pull user-data related things to CallableDescriptor

Currently, we assume user data for all non-FunctionDescriptor
declarations is empty

compiler/resolution/src/org/jetbrains/kotlin/contracts/description/LazyContractProvider.kt

@@ -16,7 +16,7 @@
 
 package org.jetbrains.kotlin.contracts.description
 
-import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.serialization.deserialization.ContractProvider
 
 /**
@@ -51,4 +51,4 @@ class LazyContractProvider(private val computation: () -> Any?) : ContractProvid
 }
 
 // For storing into UserDataMap of FunctionDescriptor
-object ContractProviderKey : FunctionDescriptor.UserDataKey<LazyContractProvider?>
+object ContractProviderKey : CallableDescriptor.UserDataKey<LazyContractProvider?>

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/util/FakeCallableDescriptorForObject.kt

@@ -76,4 +76,6 @@ open class FakeCallableDescriptorForObject(
     override fun getContainingDeclaration() = classDescriptor.getClassObjectReferenceTarget().containingDeclaration
 
     override fun substitute(substitutor: TypeSubstitutor) = this
+
+    override fun <V> getUserData(key: CallableDescriptor.UserDataKey<V>?): V? = null
 }