[KLIB] Add a reliable mechanism to check if KLIB has IR inside

^KT-62341

compiler/util-klib/src/org/jetbrains/kotlin/library/KotlinLibrary.kt

@@ -75,6 +75,7 @@ interface MetadataLibrary {
 }
 
 interface IrLibrary {
+    val hasIr: Boolean
     val dataFlowGraph: ByteArray?
     fun irDeclaration(index: Int, fileIndex: Int): ByteArray
     fun type(index: Int, fileIndex: Int): ByteArray

compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryImpl.kt

@@ -89,6 +89,12 @@ class MetadataLibraryImpl(
 abstract class IrLibraryImpl(
     val access: IrLibraryAccess<IrKotlinLibraryLayout>
 ) : IrLibrary {
+    override val hasIr by lazy {
+        access.inPlace { it: IrKotlinLibraryLayout ->
+            it.irDir.exists
+        }
+    }
+
     override val dataFlowGraph by lazy {
         access.inPlace { it: IrKotlinLibraryLayout ->
             it.dataFlowGraphFile.let { if (it.exists) it.readBytes() else null }