Hide stageController into the IrFactory

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmBackendContext.kt

@@ -37,7 +37,7 @@ class WasmBackendContext(
     @Suppress("UNUSED_PARAMETER") symbolTable: SymbolTable,
     @Suppress("UNUSED_PARAMETER") irModuleFragment: IrModuleFragment,
     val additionalExportedDeclarations: Set<FqName>,
-    override val configuration: CompilerConfiguration
+    override val configuration: CompilerConfiguration,
 ) : JsCommonBackendContext {
     override val builtIns = module.builtIns
     override var inVerbosePhase: Boolean = false
@@ -55,7 +55,7 @@ class WasmBackendContext(
         )
     }
 
-    override val mapping = JsMapping()
+    override val mapping = JsMapping(irFactory)
 
     val innerClassesSupport = JsInnerClassesSupport(mapping, irFactory)