[KLIB] Extract "ir_provider" manifest property name as a const val

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

@@ -27,6 +27,7 @@ const val KLIB_PROPERTY_CONTAINS_ERROR_CODE = "contains_error_code"
 const val KLIB_PROPERTY_INTEROP = "interop"
 const val KLIB_PROPERTY_EXPORT_FORWARD_DECLARATIONS = "exportForwardDeclarations"
 const val KLIB_PROPERTY_INCLUDED_FORWARD_DECLARATIONS = "includedForwardDeclarations"
+const val KLIB_PROPERTY_IR_PROVIDER = "ir_provider"
 
 /**
  * Copy-pasted to `kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/Utils.kt`

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

@@ -253,7 +253,7 @@ abstract class KotlinLibraryProperResolverWithAttributes<L : KotlinLibrary>(
             return false
         }
 
-        candidate.manifestProperties["ir_provider"]?.let {
+        candidate.manifestProperties[KLIB_PROPERTY_IR_PROVIDER]?.let {
             if (it !in knownIrProviders) {
                 logger.warning("skipping $candidatePath. The library requires unknown IR provider $it.")
                 return false