[FIR] Correctly process slash in class name in ClassId

^KTIJ-27358 fixed


Merge-request: KT-MR-12673
Merged-by: Egor Kulikov <Egor.Kulikov@jetbrains.com>

compiler/psi/src/org/jetbrains/kotlin/psi/stubs/KotlinStubVersions.kt

@@ -12,7 +12,7 @@ object KotlinStubVersions {
     // Though only kotlin declarations (no code in the bodies) are stubbed, please do increase this version
     //      if you are not 100% sure it can be avoided.
     // Increasing this version will lead to reindexing of all kotlin source files on the first IDE startup with the new version.
-    const val SOURCE_STUB_VERSION = 157
+    const val SOURCE_STUB_VERSION = 158
 
     // Binary stub version should be increased if stub format (org.jetbrains.kotlin.psi.stubs.impl) is changed
     //      or changes are made to the core stub building code (org.jetbrains.kotlin.idea.decompiler.stubBuilder).