Remove obsolete BuiltInFunction and mapIntrinsicFunctionSignature

This is now fully covered by the JVM signature mapping, introduced in
the previous commit. The change in KDeclarationContainerImpl.methodOwner
is needed because primitive classes have no methods on JVM; and when
we're looking for "Int.equals", we'll now look it up in the Class object
for java.lang.Integer, not for the primitive int.

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KDeclarationContainerImpl.kt

@@ -27,6 +27,7 @@ import kotlin.jvm.internal.ClassBasedDeclarationContainer
 import kotlin.reflect.jvm.internal.components.RuntimeModuleData
 import kotlin.reflect.jvm.internal.structure.createArrayType
 import kotlin.reflect.jvm.internal.structure.safeClassLoader
+import kotlin.reflect.jvm.internal.structure.wrapperByPrimitive
 
 internal abstract class KDeclarationContainerImpl : ClassBasedDeclarationContainer {
     abstract inner class Data {
@@ -37,7 +38,7 @@ internal abstract class KDeclarationContainerImpl : ClassBasedDeclarationContain
     }
 
     protected open val methodOwner: Class<*>
-        get() = jClass
+        get() = jClass.wrapperByPrimitive ?: jClass
 
     abstract val constructorDescriptors: Collection<ConstructorDescriptor>
 

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionImpl.kt

@@ -72,7 +72,6 @@ internal class KFunctionImpl private constructor(
                 val methods = jvmSignature.methods
                 return@caller AnnotationConstructorCaller(container.jClass, methods.map { it.name }, POSITIONAL_CALL, JAVA, methods)
             }
-            is BuiltInFunction -> jvmSignature.getMember(container)
         }
 
         when (member) {

core/reflection.jvm/src/kotlin/reflect/jvm/internal/RuntimeTypeMapper.kt

@@ -47,7 +47,6 @@ import org.jetbrains.kotlin.serialization.deserialization.descriptors.Deserializ
 import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedPropertyDescriptor
 import java.lang.reflect.Constructor
 import java.lang.reflect.Field
-import java.lang.reflect.Member
 import java.lang.reflect.Method
 import kotlin.reflect.jvm.internal.structure.*
 
@@ -87,16 +86,6 @@ internal sealed class JvmFunctionSignature {
         override fun asString(): String =
             methods.joinToString(separator = "", prefix = "<init>(", postfix = ")V") { it.returnType.desc }
     }
-
-    open class BuiltInFunction(private val signature: String) : JvmFunctionSignature() {
-        open fun getMember(container: KDeclarationContainerImpl): Member? = null
-
-        override fun asString(): String = signature
-
-        class Predefined(signature: String, private val member: Member) : BuiltInFunction(signature) {
-            override fun getMember(container: KDeclarationContainerImpl): Member = member
-        }
-    }
 }
 
 internal sealed class JvmPropertySignature {
@@ -175,10 +164,6 @@ internal object RuntimeTypeMapper {
 
         when (function) {
             is DeserializedCallableMemberDescriptor -> {
-                mapIntrinsicFunctionSignature(function)?.let {
-                    return it
-                }
-
                 val proto = function.proto
                 if (proto is ProtoBuf.Function) {
                     JvmProtoBufUtil.getJvmMethodSignature(proto, function.nameResolver, function.typeTable)?.let { signature ->
@@ -258,34 +243,6 @@ internal object RuntimeTypeMapper {
             else -> descriptor.name.asString()
         }
 
-    private fun mapIntrinsicFunctionSignature(function: FunctionDescriptor): JvmFunctionSignature? {
-        val parameters = function.valueParameters
-
-        when (function.name.asString()) {
-            "equals" -> if (parameters.size == 1 && KotlinBuiltIns.isNullableAny(parameters.single().type)) {
-                return JvmFunctionSignature.BuiltInFunction.Predefined(
-                    "equals(Ljava/lang/Object;)Z",
-                    Any::class.java.getDeclaredMethod("equals", Any::class.java)
-                )
-            }
-            "hashCode" -> if (parameters.isEmpty()) {
-                return JvmFunctionSignature.BuiltInFunction.Predefined(
-                    "hashCode()I",
-                    Any::class.java.getDeclaredMethod("hashCode")
-                )
-            }
-            "toString" -> if (parameters.isEmpty()) {
-                return JvmFunctionSignature.BuiltInFunction.Predefined(
-                    "toString()Ljava/lang/String;",
-                    Any::class.java.getDeclaredMethod("toString")
-                )
-            }
-            // TODO: generalize and support other functions from built-ins
-        }
-
-        return null
-    }
-
     fun mapJvmClassToKotlinClassId(klass: Class<*>): ClassId {
         if (klass.isArray) {
             klass.componentType.primitiveType?.let {