[IR] Drop TODO from IrModuleFragmentImpl

This TODO doesn't have any description, and it is already
hard to understand what the author meant.

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrModuleFragmentImpl.kt

@@ -27,7 +27,7 @@ class IrModuleFragmentImpl(
     override val irBuiltins: IrBuiltIns,
     files: List<IrFile> = emptyList(),
 ) : IrModuleFragment() {
-    override val name: Name get() = descriptor.name // TODO
+    override val name: Name get() = descriptor.name
 
     override val files: MutableList<IrFile> = files.toMutableList()
 }