Type Approximation: add separate flag to control approx. anonymous type

This extra flexibility is useful for IDE where we always want to
approximate anonymous types but may not want to approximate other local
 types

compiler/fir/providers/src/org/jetbrains/kotlin/fir/types/ConeTypeContext.kt

@@ -24,6 +24,7 @@ import org.jetbrains.kotlin.fir.symbols.ensureResolved
 import org.jetbrains.kotlin.fir.symbols.impl.*
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.FqNameUnsafe
+import org.jetbrains.kotlin.name.SpecialNames
 import org.jetbrains.kotlin.name.StandardClassIds
 import org.jetbrains.kotlin.types.TypeCheckerState
 import org.jetbrains.kotlin.types.TypeCheckerState.SupertypesPolicy.DoCustomTransform
@@ -47,6 +48,11 @@ interface ConeTypeContext : TypeSystemContext, TypeSystemOptimizationContext, Ty
         return classId.isLocal
     }
 
+    override fun TypeConstructorMarker.isAnonymous(): Boolean {
+        if (this !is ConeClassLikeLookupTag) return false
+        return name == SpecialNames.ANONYMOUS
+    }
+
     override val TypeVariableTypeConstructorMarker.typeParameter: TypeParameterMarker?
         get() {
             require(this is ConeTypeVariableTypeConstructor)