[IR] Improve stepping/LVT behavior around destructuring

compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmGeneratorExtensionsImpl.kt

@@ -17,6 +17,7 @@ import org.jetbrains.kotlin.config.languageVersionSettings
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.FilteredAnnotations
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
+import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.backend.jvm.serialization.JvmIrMangler
 import org.jetbrains.kotlin.ir.builders.declarations.addConstructor
@@ -24,7 +25,6 @@ import org.jetbrains.kotlin.ir.builders.declarations.buildClass
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
-import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.expressions.IrDelegatingConstructorCall
 import org.jetbrains.kotlin.ir.expressions.impl.IrDelegatingConstructorCallImpl
 import org.jetbrains.kotlin.ir.symbols.impl.DescriptorlessExternalPackageFragmentSymbol
@@ -252,4 +252,7 @@ open class JvmGeneratorExtensionsImpl(
 
     override val parametersAreAssignable: Boolean
         get() = true
+
+    override val debugInfoOnlyOnVariablesInDestructuringDeclarations: Boolean
+        get() = true
 }

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/TypeOperatorLowering.kt

@@ -722,10 +722,10 @@ private class TypeOperatorLowering(private val backendContext: JvmBackendContext
                 val source = if (owner is IrFunction && owner.isDelegated()) {
                     "${owner.name.asString()}(...)"
                 } else {
-                    val (startOffset, endOffset) = expression.extents()
                     val declarationParent = parent as? IrDeclaration
                     val sourceView = declarationParent?.let(::sourceViewFor)
-                    if (sourceView != null && startOffset >= 0 && endOffset < sourceView.length) {
+                    val (startOffset, endOffset) = expression.extents()
+                    if (sourceView?.validSourcePosition(startOffset, endOffset) == true) {
                         sourceView.subSequence(startOffset, endOffset).toString()
                     } else {
                         // Fallback for inconsistent line numbers
@@ -757,6 +757,9 @@ private class TypeOperatorLowering(private val backendContext: JvmBackendContext
         origin == IrDeclarationOrigin.DELEGATED_PROPERTY_ACCESSOR ||
                 origin == IrDeclarationOrigin.DELEGATED_MEMBER
 
+    private fun CharSequence.validSourcePosition(startOffset: Int, endOffset: Int): Boolean =
+        startOffset in 0 until endOffset && endOffset < length
+
     private fun IrElement.extents(): Pair<Int, Int> {
         var startOffset = Int.MAX_VALUE
         var endOffset = 0