Move out JVM debugger functionality

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/Utils.kt

@@ -29,16 +29,6 @@ fun <E> MutableList<E>.pop() = this.removeAt(size - 1)
 
 fun <E> MutableList<E>.peek(): E? = if (size == 0) null else this[size - 1]
 
-fun <T> Collection<T>.atMostOne(): T? {
-    return when (this.size) {
-        0 -> null
-        1 -> this.iterator().next()
-        else -> throw IllegalArgumentException("Collection has more than one element.")
-    }
-}
-
-inline fun <T> Iterable<T>.atMostOne(predicate: (T) -> Boolean): T? = this.filter(predicate).atMostOne()
-
 fun <T: Any> T.onlyIf(condition: T.()->Boolean, then: (T)->Unit): T {
     if (this.condition()) then(this)
     return this

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LowerUtils.kt

@@ -18,10 +18,8 @@ package org.jetbrains.kotlin.backend.common.lower
 
 import org.jetbrains.kotlin.backend.common.BackendContext
 import org.jetbrains.kotlin.backend.common.CommonBackendContext
-import org.jetbrains.kotlin.backend.common.atMostOne
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.impl.ValueParameterDescriptorImpl
-import org.jetbrains.kotlin.incremental.components.LookupLocation
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
@@ -34,16 +32,12 @@ import org.jetbrains.kotlin.ir.symbols.IrSymbol
 import org.jetbrains.kotlin.ir.types.IrSimpleType
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.classifierOrFail
-import org.jetbrains.kotlin.ir.types.isAny
 import org.jetbrains.kotlin.ir.util.defaultType
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.name.Name
-import org.jetbrains.kotlin.resolve.scopes.DescriptorKindFilter
-import org.jetbrains.kotlin.resolve.scopes.MemberScopeImpl
-import org.jetbrains.kotlin.utils.Printer
 
 class IrLoweringContext(backendContext: BackendContext) : IrGeneratorContextBase(backendContext.irBuiltIns)
 
@@ -166,29 +160,6 @@ open class IrBuildingTransformer(private val context: BackendContext) : IrElemen
     }
 }
 
-class SimpleMemberScope(val members: List<DeclarationDescriptor>) : MemberScopeImpl() {
-
-    override fun getContributedClassifier(name: Name, location: LookupLocation): ClassifierDescriptor? =
-        members.filterIsInstance<ClassifierDescriptor>()
-            .atMostOne { it.name == name }
-
-    override fun getContributedVariables(name: Name, location: LookupLocation): Collection<PropertyDescriptor> =
-        members.filterIsInstance<PropertyDescriptor>()
-            .filter { it.name == name }
-
-    override fun getContributedFunctions(name: Name, location: LookupLocation): Collection<SimpleFunctionDescriptor> =
-        members.filterIsInstance<SimpleFunctionDescriptor>()
-            .filter { it.name == name }
-
-    override fun getContributedDescriptors(
-        kindFilter: DescriptorKindFilter,
-        nameFilter: (Name) -> Boolean
-    ): Collection<DeclarationDescriptor> =
-        members.filter { kindFilter.accepts(it) && nameFilter(it.name) }
-
-    override fun printScopeStructure(p: Printer) = TODO("not implemented")
-}
-
 fun IrConstructor.callsSuper(irBuiltIns: IrBuiltIns): Boolean {
     val constructedClass = parent as IrClass
     val superClass = constructedClass.superTypes