JS_IR: remove stub generator from IrBuiltins

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/serialization/DeclarationTable.kt

@@ -9,6 +9,7 @@ import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrAnonymousInitializerImpl
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
+import org.jetbrains.kotlin.ir.symbols.IrSymbol
 
 class DescriptorTable {
     private val descriptors = mutableMapOf<DeclarationDescriptor, Long>()
@@ -21,18 +22,19 @@ class DescriptorTable {
 // TODO: We don't manage id clashes anyhow now.
 abstract class DeclarationTable(val builtIns: IrBuiltIns, val descriptorTable: DescriptorTable, mangler: KotlinMangler): KotlinMangler by mangler {
 
+    private val builtInsTable = mutableMapOf<IrSymbol, UniqId>()
     private val table = mutableMapOf<IrDeclaration, UniqId>()
     val descriptors = descriptorTable
     protected abstract var currentIndex: Long
 
     open fun loadKnownBuiltins(): Long {
         builtIns.knownBuiltins.forEach {
-            table.put(it, UniqId(currentIndex++, false))
+            builtInsTable[it] = UniqId(currentIndex++, false)
         }
         return currentIndex
     }
 
-    fun uniqIdByDeclaration(value: IrDeclaration) = table.getOrPut(value) {
+    fun uniqIdByDeclaration(value: IrDeclaration) = (value as? IrSymbolOwner)?.let { builtInsTable[it.symbol] } ?: table.getOrPut(value) {
         computeUniqIdByDeclaration(value)
     }
 
@@ -55,4 +57,4 @@ abstract class DeclarationTable(val builtIns: IrBuiltIns, val descriptorTable: D
 
 // This is what we pre-populate tables with
 val IrBuiltIns.knownBuiltins
-    get() = irBuiltInsExternalPackageFragment.declarations
+    get() = irBuiltInsSymbols

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/serialization/KotlinIrLinker.kt

@@ -258,9 +258,8 @@ abstract class KotlinIrLinker(
     private fun loadKnownBuiltinSymbols(): Long {
         var currentIndex = firstKnownBuiltinsIndex
         builtIns.knownBuiltins.forEach {
-            require(it is IrFunction)
-            deserializedSymbols[UniqIdKey(null, UniqId(currentIndex, isLocal = false))] = it.symbol
-            assert(symbolTable.referenceSimpleFunction(it.descriptor) == it.symbol)
+            deserializedSymbols[UniqIdKey(null, UniqId(currentIndex, isLocal = false))] = it
+            assert(symbolTable.referenceSimpleFunction(it.descriptor) == it)
             currentIndex++
         }
         return currentIndex