Partial code cleanup: can be private and some others applied

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/structure/impl/classFiles/BinaryJavaClass.kt

@@ -39,7 +39,7 @@ class BinaryJavaClass(
         override val outerClass: JavaClass?,
         classContent: ByteArray? = null
 ) : ClassVisitor(ASM_API_VERSION_FOR_CLASS_READING), VirtualFileBoundJavaClass, BinaryJavaModifierListOwner, MapBasedJavaAnnotationOwner {
-    lateinit var myInternalName: String
+    private lateinit var myInternalName: String
 
     override val annotations: MutableCollection<JavaAnnotation> = ContainerUtil.newSmartList()
     override lateinit var typeParameters: List<JavaTypeParameter>

compiler/frontend.java/src/org/jetbrains/kotlin/load/kotlin/incremental/IncrementalPackageFragmentProvider.kt

@@ -47,7 +47,7 @@ class IncrementalPackageFragmentProvider(
         val target: TargetId,
         private val kotlinClassFinder: KotlinClassFinder
 ) : PackageFragmentProvider {
-    val fqNameToPackageFragment =
+    private val fqNameToPackageFragment =
             PackagePartClassUtils.getFilesWithCallables(sourceFiles)
                     .mapTo(hashSetOf()) { it.packageFqName }
                     .keysToMap(this::IncrementalPackageFragment)

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/JvmSimpleNameBacktickChecker.kt

@@ -47,7 +47,7 @@ object JvmSimpleNameBacktickChecker : IdentifierChecker {
         }
     }
 
-    fun checkNamed(declaration: KtNamedDeclaration, diagnosticHolder: DiagnosticSink) {
+    private fun checkNamed(declaration: KtNamedDeclaration, diagnosticHolder: DiagnosticSink) {
         val name = declaration.name ?: return
 
         val element = declaration.nameIdentifier ?: declaration