[JVM IR] Use names of local functions in names of local classes.

This undoes changes in
https://github.com/JetBrains/kotlin/commit/fbe66c3496d082d2d487b2c39673f0cd4ac5b70a
which broke calculation of the simple name of local classes in
reflection (the enclosing method was not a substring of the name of the
local class).

compiler/testData/codegen/box/reflection/classes/localClassSimpleName.kt

@@ -1,5 +1,4 @@
 // IGNORE_BACKEND_FIR: JVM_IR
-// IGNORE_BACKEND: JVM_IR
 // IGNORE_BACKEND: NATIVE
 // WITH_RUNTIME