[IR] Commonized SAM equals/hashCode builder

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsIrBackendContext.kt

@@ -215,6 +215,9 @@ class JsIrBackendContext(
             override val coroutineGetContext = symbolTable.referenceSimpleFunction(getJsInternalFunction(GET_COROUTINE_CONTEXT_NAME))
 
             override val returnIfSuspended = symbolTable.referenceSimpleFunction(getJsInternalFunction("returnIfSuspended"))
+
+            override val functionAdapter: IrClassSymbol
+                get() = TODO("Not implemented")
         }
 
         override fun unfoldInlineClassType(irType: IrType): IrType? {

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/JsSingleAbstractMethodLowering.kt

@@ -28,6 +28,8 @@ class JsSingleAbstractMethodLowering(context: JsIrBackendContext) : SingleAbstra
         return Visibilities.PRIVATE
     }
 
+    override val IrType.needEqualsHashCodeMethods get() = false
+
     private var enclosingBodyContainer: IrDeclaration? = null
 
     override fun lower(irFile: IrFile) {