Pass isPackage = false when processing class proto

KT-8487

jps-plugin/testData/incremental/pureKotlin/objectConstantChanged/build.log

@@ -15,4 +15,4 @@ Compiling files:
   src/usage.kt
 End of files
 Exit code: OK
-------------------------------------------
+------------------------------------------

jps-plugin/testData/incremental/pureKotlin/objectConstantChanged/experimental-ic-build.log

@@ -6,7 +6,9 @@ End of files
 Compiling files:
   src/const.kt
 End of files
-Exit code: OK
+Marked as dirty by Kotlin:
+  src/usage.kt
+Exit code: ADDITIONAL_PASS_REQUIRED
 ------------------------------------------
 Cleaning output files:
   out/production/module/test/Object.class