[FIR] Cache callable names in some composite scopes

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassUseSiteMemberScope.kt

@@ -53,10 +53,12 @@ class JavaClassUseSiteMemberScope(
     
     private val canUseSpecialGetters: Boolean by lazy { !klass.hasKotlinSuper(session) }
 
-    override fun getCallableNames(): Set<Name> {
+    private val callableNamesCached by lazy(LazyThreadSafetyMode.PUBLICATION) {
-        return declaredMemberScope.getContainingCallableNamesIfPresent() + superTypesScope.getCallableNames()
+        declaredMemberScope.getContainingCallableNamesIfPresent() + superTypesScope.getCallableNames()
     }
 
+    override fun getCallableNames(): Set<Name> = callableNamesCached
+
     override fun getClassifierNames(): Set<Name> {
         return declaredMemberScope.getContainingClassifierNamesIfPresent() + superTypesScope.getClassifierNames()
     }

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/AbstractFirUseSiteMemberScope.kt

@@ -22,6 +22,10 @@ abstract class AbstractFirUseSiteMemberScope(
     protected val directOverriddenFunctions = hashMapOf<FirNamedFunctionSymbol, Collection<FirNamedFunctionSymbol>>()
     protected val directOverriddenProperties = hashMapOf<FirPropertySymbol, MutableList<FirPropertySymbol>>()
 
+    private val callableNamesCached by lazy(LazyThreadSafetyMode.PUBLICATION) {
+        declaredMemberScope.getContainingCallableNamesIfPresent() + superTypesScope.getCallableNames()
+    }
+
     override fun processFunctionsByName(name: Name, processor: (FirNamedFunctionSymbol) -> Unit) {
         functions.getOrPut(name) {
             doProcessFunctions(name)
@@ -89,9 +93,7 @@ abstract class AbstractFirUseSiteMemberScope(
         declaredMemberScope.processDeclaredConstructors(processor)
     }
 
-    override fun getCallableNames(): Set<Name> {
+    override fun getCallableNames(): Set<Name> = callableNamesCached
-        return declaredMemberScope.getContainingCallableNamesIfPresent() + superTypesScope.getCallableNames()
-    }
 
     override fun getClassifierNames(): Set<Name> {
         return declaredMemberScope.getContainingClassifierNamesIfPresent() + superTypesScope.getClassifierNames()

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirTypeIntersectionScope.kt

@@ -42,6 +42,10 @@ class FirTypeIntersectionScope private constructor(
 
     private val intersectionOverrides: MutableMap<FirCallableSymbol<*>, MemberWithBaseScope<out FirCallableSymbol<*>>> = mutableMapOf()
 
+    private val callableNamesCached by lazy(LazyThreadSafetyMode.PUBLICATION) {
+        scopes.flatMapTo(mutableSetOf()) { it.getCallableNames() }
+    }
+
     override fun processFunctionsByName(name: Name, processor: (FirNamedFunctionSymbol) -> Unit) {
         if (!processCallablesByName(name, processor, absentFunctions, FirScope::processFunctionsByName)) {
             super.processFunctionsByName(name, processor)
@@ -540,9 +544,7 @@ class FirTypeIntersectionScope private constructor(
         return ProcessorAction.NEXT
     }
 
-    override fun getCallableNames(): Set<Name> {
+    override fun getCallableNames(): Set<Name> = callableNamesCached
-        return scopes.flatMapTo(mutableSetOf()) { it.getCallableNames() }
-    }
 
     override fun getClassifierNames(): Set<Name> {
         return scopes.flatMapTo(hashSetOf()) { it.getClassifierNames() }