Remove unused modification tracker in KotlinClassInnerStuffCache

'dropCaches()' is not used anywhere both in the compiler and in the IDE.

analysis/decompiled/light-classes-for-decompiled/src/org/jetbrains/kotlin/analysis/decompiled/light/classes/KtLightClassForDecompiledDeclaration.kt

@@ -30,7 +30,7 @@ open class KtLightClassForDecompiledDeclaration(
 
     private val myInnersCache = KotlinClassInnerStuffCache(
         myClass = this,
-        externalDependencies = listOf(KotlinModificationTrackerService.getInstance(manager.project).outOfBlockModificationTracker),
+        dependencies = listOf(KotlinModificationTrackerService.getInstance(manager.project).outOfBlockModificationTracker),
         lazyCreator = LightClassesLazyCreator(project)
     )
 

analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/classes/FirLightClassBase.kt

@@ -66,7 +66,7 @@ abstract class FirLightClassBase protected constructor(manager: PsiManager) : Li
 
     private val myInnersCache = KotlinClassInnerStuffCache(
         myClass = this@FirLightClassBase,
-        externalDependencies = listOf(manager.project.createProjectWideOutOfBlockModificationTracker()),
+        dependencies = listOf(manager.project.createProjectWideOutOfBlockModificationTracker()),
         lazyCreator = FirLightClassesLazyCreator(project)
     )
 

compiler/light-classes/src/org/jetbrains/kotlin/asJava/classes/KotlinClassInnerStuffCache.kt

@@ -6,7 +6,6 @@
 package org.jetbrains.kotlin.asJava.classes
 
 import com.intellij.openapi.diagnostic.Logger
-import com.intellij.openapi.util.SimpleModificationTracker
 import com.intellij.psi.*
 import com.intellij.psi.impl.PsiClassImplUtil
 import com.intellij.psi.impl.PsiImplUtil
@@ -21,12 +20,9 @@ import org.jetbrains.kotlin.utils.SmartList
 
 class KotlinClassInnerStuffCache(
     private val myClass: PsiExtensibleClass,
-    externalDependencies: List<Any>,
+    private val dependencies: List<Any>,
     private val lazyCreator: LazyCreator,
 ) {
-    private val myTracker = SimpleModificationTracker()
-    private val dependencies: List<Any> = externalDependencies + myTracker
-
     abstract class LazyCreator {
         abstract fun <T : Any> get(initializer: () -> T, dependencies: List<Any>): Lazy<T>
     }
@@ -182,10 +178,6 @@ class KotlinClassInnerStuffCache(
         }
     }
 
-    fun dropCaches() {
-        myTracker.incModificationCount()
-    }
-
     companion object {
         private const val VALUES_METHOD = "values"
         private const val VALUE_OF_METHOD = "valueOf"

compiler/light-classes/src/org/jetbrains/kotlin/asJava/classes/KtLightClassBase.kt

@@ -32,7 +32,7 @@ abstract class KtLightClassBase protected constructor(manager: PsiManager)
     : AbstractLightClass(manager, KotlinLanguage.INSTANCE), KtLightClass, PsiExtensibleClass {
     protected open val myInnersCache = KotlinClassInnerStuffCache(
         myClass = this,
-        externalDependencies = listOf(KotlinModificationTrackerService.getInstance(manager.project).outOfBlockModificationTracker),
+        dependencies = listOf(KotlinModificationTrackerService.getInstance(manager.project).outOfBlockModificationTracker),
         lazyCreator = LightClassesLazyCreator(project)
     )
 

compiler/light-classes/src/org/jetbrains/kotlin/asJava/classes/KtLightClassForSourceDeclaration.kt

@@ -74,7 +74,7 @@ abstract class KtLightClassForSourceDeclaration(
 
     override val myInnersCache: KotlinClassInnerStuffCache = KotlinClassInnerStuffCache(
         myClass = this,
-        externalDependencies = classOrObject.getExternalDependencies(),
+        dependencies = classOrObject.getExternalDependencies(),
         lazyCreator = LightClassesLazyCreator(project)
     )