[K/N] Cache `FqName`s computed from `ClassId`s in KonanMangler

compiler/ir/serialization.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanMangler.kt

diff --git a/compiler/ir/serialization.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanMangler.kt b/compiler/ir/serialization.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanMangler.kt
index 322a48e..0f17ee9 100644
--- a/compiler/ir/serialization.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanMangler.kt
+++ b/compiler/ir/serialization.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanMangler.kt
@@ -18,6 +18,7 @@
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.util.hasAnnotation
+import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.NativeRuntimeNames
 import org.jetbrains.kotlin.name.NativeStandardInteropNames
 
@@ -29,6 +30,8 @@
     NativeRuntimeNames.Annotations.exportForCompilerClassId,
 )
 
+private val ANNOTATIONS_TO_TREAT_AS_EXPORTED_FQNS = ANNOTATIONS_TO_TREAT_AS_EXPORTED.map(ClassId::asSingleFqName)
+
 abstract class AbstractKonanIrMangler(
         private val withReturnType: Boolean,
         private val allowOutOfScopeTypeParameters: Boolean = false
@@ -89,7 +92,7 @@
             if (kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE) return false
         }
 
-        return ANNOTATIONS_TO_TREAT_AS_EXPORTED.any { annotations.hasAnnotation(it.asSingleFqName()) }
+        return ANNOTATIONS_TO_TREAT_AS_EXPORTED_FQNS.any(annotations::hasAnnotation)
     }