Remove stale TODO

Change-Id: I1b7dbbc0290c48309c9cbf00a432e3beccd27bcf
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/31540
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: dan sinclair <dsinclair@chromium.org>

src/reader/spirv/function.cc

@@ -1687,7 +1687,6 @@ bool FunctionEmitter::EmitFunctionVariables() {
           parser_impl_.MakeConstantExpression(inst.GetSingleWordInOperand(1))
               .expr);
     }
-    // TODO(dneto): Add the initializer via Variable::set_constructor.
     auto var_decl_stmt =
         std::make_unique<ast::VariableDeclStatement>(std::move(var));
     AddStatementForInstruction(std::move(var_decl_stmt), inst);