Fix searching serialized classes package contains multiple fragments

jps-plugin/testData/incremental/pureKotlin/functionReferencingClass/A.kt

@@ -0,0 +1 @@
+class A(val x: Int)

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

@@ -0,0 +1,11 @@
+================ Step #1 =================
+
+Cleaning output files:
+  out/production/module/META-INF/module.kotlin_module
+  out/production/module/UseAKt.class
+End of files
+Compiling files:
+  src/useA.kt
+End of files
+Exit code: OK
+------------------------------------------

jps-plugin/testData/incremental/pureKotlin/functionReferencingClass/useA.kt

@@ -0,0 +1 @@
+fun useA(a: A) { a.x }