[KLIB] Extract "ir_provider" manifest property name as a const val, p.2

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

@@ -115,6 +115,9 @@ val KotlinLibrary.exportForwardDeclarations: List<String>
 val KotlinLibrary.includedForwardDeclarations: List<String>
     get() = manifestProperties.propertyList(KLIB_PROPERTY_INCLUDED_FORWARD_DECLARATIONS, escapeInQuotes = true)
 
+val BaseKotlinLibrary.irProviderName: String?
+    get() = manifestProperties.getProperty(KLIB_PROPERTY_IR_PROVIDER)
+
 val BaseKotlinLibrary.nativeTargets: List<String>
     get() = manifestProperties.propertyList(KLIB_PROPERTY_NATIVE_TARGETS)
 

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

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