[JVM_IR] Fix incorrect name in inner class attributes.

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

@@ -53,6 +53,10 @@ class IrTypeMapper(private val context: JvmBackendContext) : KotlinTypeMapperBas
         }
 
     private fun computeClassInternalName(irClass: IrClass): StringBuilder {
+        context.getLocalClassType(irClass)?.internalName?.let {
+            return StringBuilder(it)
+        }
+
         val shortName = SpecialNames.safeIdentifier(irClass.name).identifier
 
         when (val parent = irClass.parent) {
@@ -73,11 +77,6 @@ class IrTypeMapper(private val context: JvmBackendContext) : KotlinTypeMapperBas
                 }
         }
 
-        val localClassType = context.getLocalClassType(irClass)
-        if (localClassType != null) {
-            return StringBuilder(localClassType.internalName)
-        }
-
         error(
             "Local class should have its name computed in InventNamesForLocalClasses: ${irClass.fqNameWhenAvailable}\n" +
                     "Ensure that any lowering that transforms elements with local class info (classes, function references) " +

compiler/testData/codegen/box/coroutines/kt42554.kt

@@ -1,14 +1,5 @@
 // WITH_RUNTIME
 
-// Need to ignore dexing for now. This generates invalid inner-class attributes on the IR backend.
-//
-// java.lang.AssertionError: D8 dexing error: D8 dexing info: Malformed inner-class attribute:
-//	outerTypeInternal: C$result$1
-//	innerTypeInternal: C$no_name_in_PSI_3d19d79d_1ba9_4cd0_b7f5_b46aa3cd5d40$WhenMappings
-//	innerName: WhenMappings
-//
-// IGNORE_DEXING
-
 import kotlin.coroutines.*
 
 fun launch(block: suspend () -> String): String {