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/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/IrTypeSystemContext.kt

@@ -24,6 +24,7 @@ import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.FqNameUnsafe
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.name.SpecialNames
 import org.jetbrains.kotlin.types.TypeCheckerState
 import org.jetbrains.kotlin.types.TypeSystemCommonBackendContext
 import org.jetbrains.kotlin.types.Variance
@@ -310,6 +311,11 @@ interface IrTypeSystemContext : TypeSystemContext, TypeSystemCommonSuperTypesCon
         return this.owner.classId?.isLocal == true
     }
 
+    override fun TypeConstructorMarker.isAnonymous(): Boolean {
+        if (this !is IrClassSymbol) return false
+        return this.owner.classId?.shortClassName == SpecialNames.ANONYMOUS
+    }
+
     override val TypeVariableTypeConstructorMarker.typeParameter: TypeParameterMarker?
         get() = error("Type variables is unsupported in IR")