Cleanup JavaElement model from methods used only in substitutor

Downcast everything used in JavaTypeSubstitutorImpl to *Impl, remove methods
from interfaces, inline/move some of them

core/descriptors.runtime/src/org/jetbrains/kotlin/load/java/structure/reflect/ReflectJavaClass.kt

@@ -81,8 +81,6 @@ class ReflectJavaClass(
             .map(::ReflectJavaConstructor)
             .toList()
 
-    override fun getDefaultType(): ReflectJavaClassifierType = throw UnsupportedOperationException()
-
     // TODO: drop OriginKind
     override fun getOriginKind() = JavaClass.OriginKind.COMPILED
 

core/descriptors.runtime/src/org/jetbrains/kotlin/load/java/structure/reflect/ReflectJavaClassifierType.kt

@@ -39,8 +39,6 @@ class ReflectJavaClassifierType(public override val type: Type) : ReflectJavaTyp
 
     override fun getClassifier(): JavaClassifier = classifier
 
-    override fun getSupertypes(): Collection<JavaClassifierType> = throw UnsupportedOperationException()
-
     override fun getPresentableText(): String = type.toString()
 
     override fun isRaw(): Boolean = with(type) { this is Class<*> && getTypeParameters().isNotEmpty() }

core/descriptors.runtime/src/org/jetbrains/kotlin/load/java/structure/reflect/ReflectJavaType.kt

@@ -16,7 +16,6 @@
 
 package org.jetbrains.kotlin.load.java.structure.reflect
 
-import org.jetbrains.kotlin.load.java.structure.JavaArrayType
 import org.jetbrains.kotlin.load.java.structure.JavaType
 import java.lang.reflect.GenericArrayType
 import java.lang.reflect.Type
@@ -25,8 +24,6 @@ import java.lang.reflect.WildcardType
 abstract class ReflectJavaType : JavaType {
     protected abstract val type: Type
 
-    override fun createArrayType(): JavaArrayType = throw UnsupportedOperationException()
-
     companion object Factory {
         fun create(type: Type): ReflectJavaType {
             return when {

core/descriptors.runtime/src/org/jetbrains/kotlin/load/java/structure/reflect/ReflectJavaTypeParameter.kt

@@ -16,11 +16,9 @@
 
 package org.jetbrains.kotlin.load.java.structure.reflect
 
-import org.jetbrains.kotlin.load.java.structure.*
+import org.jetbrains.kotlin.load.java.structure.JavaTypeParameter
 import org.jetbrains.kotlin.name.Name
 import java.lang.reflect.AnnotatedElement
-import java.lang.reflect.Constructor
-import java.lang.reflect.Method
 import java.lang.reflect.TypeVariable
 
 class ReflectJavaTypeParameter(
@@ -36,20 +34,6 @@ class ReflectJavaTypeParameter(
         // TypeVariable is AnnotatedElement only in JDK8
         get() = typeVariable as? AnnotatedElement
 
-    override fun getOwner(): JavaTypeParameterListOwner? {
-        val owner = typeVariable.genericDeclaration
-        return when (owner) {
-            is Class<*> -> ReflectJavaClass(owner)
-            is Method -> ReflectJavaMethod(owner)
-            is Constructor<*> -> ReflectJavaConstructor(owner)
-            else -> throw UnsupportedOperationException("Unsupported type parameter list owner (${owner.javaClass}): $owner")
-        }
-    }
-
-    override fun getType(): JavaType = throw UnsupportedOperationException()
-
-    override fun getTypeProvider(): JavaTypeProvider = throw UnsupportedOperationException()
-
     override fun getName() = Name.identifier(typeVariable.name)
 
     override fun equals(other: Any?) = other is ReflectJavaTypeParameter && typeVariable == other.typeVariable

core/descriptors.runtime/src/org/jetbrains/kotlin/load/java/structure/reflect/ReflectJavaWildcardType.kt

@@ -16,7 +16,6 @@
 
 package org.jetbrains.kotlin.load.java.structure.reflect
 
-import org.jetbrains.kotlin.load.java.structure.JavaTypeProvider
 import org.jetbrains.kotlin.load.java.structure.JavaWildcardType
 import java.lang.reflect.WildcardType
 
@@ -35,6 +34,4 @@ class ReflectJavaWildcardType(override val type: WildcardType): ReflectJavaType(
     }
 
     override fun isExtends() = type.upperBounds.firstOrNull() != Any::class.java
-
-    override fun getTypeProvider(): JavaTypeProvider = throw UnsupportedOperationException()
 }