JVM IR: Remove special descriptor origin for lambdas.

This was a hack to allow plugins to identify anonymous classes in
inline function scope. However, this stopped working for anonymous
objects with the introduction of IrBasedDescriptors and became redundant
with the public ABI bit in the Kotlin Metadata annotation.

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ClassCodegen.kt

@@ -28,7 +28,6 @@ import org.jetbrains.kotlin.ir.descriptors.toIrBasedDescriptor
 import org.jetbrains.kotlin.ir.expressions.IrBlockBody
 import org.jetbrains.kotlin.ir.expressions.IrConst
 import org.jetbrains.kotlin.ir.expressions.IrExpression
-import org.jetbrains.kotlin.ir.expressions.IrFunctionReference
 import org.jetbrains.kotlin.ir.expressions.impl.IrBlockBodyImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrSetFieldImpl
 import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
@@ -484,20 +483,10 @@ class ClassCodegen private constructor(
     private val IrDeclaration.descriptorOrigin: JvmDeclarationOrigin
         get() {
             val psiElement = PsiSourceManager.findPsiElement(this)
-            // For declarations inside lambdas, produce a descriptor which refers back to the original function.
-            // This is needed for plugins which check for lambdas inside of inline functions using the descriptor
-            // contained in JvmDeclarationOrigin. This matches the behavior of the JVM backend.
-            // TODO: this is really not very useful, as this does nothing for other anonymous objects.
-            val isLambda = irClass.origin == JvmLoweredDeclarationOrigin.LAMBDA_IMPL ||
-                    irClass.origin == JvmLoweredDeclarationOrigin.SUSPEND_LAMBDA
-            val descriptor = if (isLambda)
-                irClass.attributeOwnerId.safeAs<IrFunctionReference>()?.symbol?.owner?.toIrBasedDescriptor() ?: toIrBasedDescriptor()
-            else
-                toIrBasedDescriptor()
             return if (origin == IrDeclarationOrigin.FILE_CLASS)
-                JvmDeclarationOrigin(JvmDeclarationOriginKind.PACKAGE_PART, psiElement, descriptor)
+                JvmDeclarationOrigin(JvmDeclarationOriginKind.PACKAGE_PART, psiElement, toIrBasedDescriptor())
             else
-                OtherOrigin(psiElement, descriptor)
+                OtherOrigin(psiElement, toIrBasedDescriptor())
         }
 
     companion object {