Debugger: fix breakpoints in files with JvmName annotation

Drop unnessecary logic about part classes with hashcodes
#KT-9480 Fixed

idea/testData/debugger/positionManager/JvmNameAnnotation.kt

@@ -0,0 +1,6 @@
+@file:JvmName("ABC")
+package a
+
+fun foo() {
+    ""   // a/ABC
+}