[JVM_IR] Fix incorrect name in inner class attributes.

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 {