Got rid of LazyIrProvider. It is not used anymore

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeclarationStubGenerator.kt

@@ -54,7 +54,6 @@ class DeclarationStubGenerator(
 
     fun setIrProviders(value: List<IrProvider>) {
         irProviders_ = value
-        irProviders_.filterIsInstance<LazyIrProvider>().forEach { it.declarationStubGenerator = this }
     }
 
     val typeTranslator =

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/SymbolTable.kt

@@ -37,14 +37,8 @@ interface IrProvider {
     fun getDeclaration(symbol: IrSymbol): IrDeclaration?
 }
 
-/**
- * Extension of [IrProvider] which always produces inheritors of [IrLazyDeclarationBase].
- * Thus, it needs [declarationStubGenerator] to be able to produce IR declarations.
- */
-interface LazyIrProvider : IrProvider {
-    var declarationStubGenerator: DeclarationStubGenerator
-
-    override fun getDeclaration(symbol: IrSymbol): IrLazyDeclarationBase?
+interface IrExtensionGenerator {
+    fun declare(symbol: IrSymbol): IrDeclaration? = null
 }
 
 interface IrDeserializer : IrProvider {
@@ -968,4 +962,4 @@ val SymbolTable.allUnbound: List<IrSymbol>
         r.addAll(unboundTypeAliases)
         r.addAll(unboundTypeParameters)
         return r.filter { !it.isBound }
-    }
+    }