[DLC] drop hard references to member declarations to reduce memory consumption

^KT-56613

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

@@ -12,6 +12,8 @@ import com.intellij.psi.impl.PsiImplUtil
 import com.intellij.psi.impl.PsiSuperMethodImplUtil
 import com.intellij.psi.javadoc.PsiDocComment
 import com.intellij.psi.scope.PsiScopeProcessor
+import com.intellij.psi.util.CachedValueProvider
+import com.intellij.psi.util.CachedValuesManager
 import com.intellij.psi.util.PsiUtil
 import org.jetbrains.annotations.NonNls
 import org.jetbrains.kotlin.analysis.decompiled.light.classes.origin.LightMemberOriginForCompiledField
@@ -26,6 +28,12 @@ import org.jetbrains.kotlin.asJava.isSyntheticValuesOrValueOfMethod
 import org.jetbrains.kotlin.load.java.structure.LightClassOriginKind
 import org.jetbrains.kotlin.psi.KtClassOrObject
 
+internal inline fun <R : PsiElement, T> R.cachedValueWithLibraryTracker(
+    crossinline computer: () -> T,
+): T = CachedValuesManager.getCachedValue(this) {
+    CachedValueProvider.Result.createSingleDependency(computer(), project.createAllLibrariesModificationTracker())
+}
+
 open class KtLightClassForDecompiledDeclaration(
     clsDelegate: PsiClass,
     clsParent: PsiElement,
@@ -118,8 +126,7 @@ open class KtLightClassForDecompiledDeclaration(
     override fun getAllMethods(): Array<PsiMethod> = PsiClassImplUtil.getAllMethods(this)
     override fun getAllFields(): Array<PsiField> = PsiClassImplUtil.getAllFields(this)
 
-    override fun getOwnMethods(): List<PsiMethod> = _ownMethods
+    override fun getOwnMethods(): List<PsiMethod> = cachedValueWithLibraryTracker {
-    private val _ownMethods: List<PsiMethod> by lazyPub {
         val isEnum = isEnum
         this.clsDelegate.methods.mapNotNull { psiMethod ->
             if (isSyntheticValuesOrValueOfMethod(psiMethod)) return@mapNotNull null
@@ -135,8 +142,7 @@ open class KtLightClassForDecompiledDeclaration(
         }
     }
 
-    override fun getOwnFields(): List<PsiField> = _ownFields
+    override fun getOwnFields(): List<PsiField> = cachedValueWithLibraryTracker {
-    private val _ownFields: List<PsiField> by lazyPub {
         this.clsDelegate.fields.map { psiField ->
             if (psiField is PsiEnumConstant) {
                 KtLightEnumEntryForDecompiledDeclaration(
@@ -155,8 +161,7 @@ open class KtLightClassForDecompiledDeclaration(
         }
     }
 
-    override fun getOwnInnerClasses(): List<PsiClass> = _ownInnerClasses
+    override fun getOwnInnerClasses(): List<PsiClass> = cachedValueWithLibraryTracker {
-    private val _ownInnerClasses: List<PsiClass> by lazyPub {
         this.clsDelegate.innerClasses.map { psiClass ->
             val innerDeclaration = this.kotlinOrigin
                 ?.declarations

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

@@ -5,7 +5,6 @@ package org.jetbrains.kotlin.analysis.decompiled.light.classes
 import com.intellij.psi.*
 import org.jetbrains.kotlin.analysis.decompiled.light.classes.origin.LightMemberOriginForCompiledField
 import org.jetbrains.kotlin.analysis.decompiler.psi.file.KtClsFile
-import org.jetbrains.kotlin.asJava.classes.lazyPub
 
 internal class KtLightEnumEntryForDecompiledDeclaration(
     private val fldDelegate: PsiEnumConstant,
@@ -22,8 +21,7 @@ internal class KtLightEnumEntryForDecompiledDeclaration(
     override fun resolveMethod(): PsiMethod? = fldDelegate.resolveMethod()
     override fun resolveMethodGenerics(): JavaResolveResult = fldDelegate.resolveMethodGenerics()
 
-    override fun getInitializingClass(): PsiEnumConstantInitializer? = _initializingClass
+    override fun getInitializingClass(): PsiEnumConstantInitializer? = cachedValueWithLibraryTracker {
-    private val _initializingClass: PsiEnumConstantInitializer? by lazyPub {
         fldDelegate.initializingClass?.let {
             KtLightEnumClassForDecompiledDeclaration(
                 psiConstantInitializer = it,

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

@@ -55,7 +55,8 @@ open class KtLightFieldForDecompiledDeclaration(
 
     override fun computeConstantValue(): Any? = fldDelegate.computeConstantValue()
 
-    override fun computeConstantValue(visitedVars: MutableSet<PsiVariable>?): Any? = (fldDelegate as? PsiVariableEx)?.computeConstantValue(visitedVars)
+    override fun computeConstantValue(visitedVars: MutableSet<PsiVariable>?): Any? =
+        (fldDelegate as? PsiVariableEx)?.computeConstantValue(visitedVars)
 
     override fun equals(other: Any?): Boolean = other === this ||
             other is KtLightFieldForDecompiledDeclaration &&