[gn] tblgen opts for llvm-cgdata

This should have been part of 5ec73b7.

Author: nico

llvm/utils/gn/secondary/llvm/tools/llvm-cgdata/BUILD.gn

@@ -1,11 +1,19 @@
+import("//llvm/utils/TableGen/tablegen.gni")
 import("//llvm/utils/gn/build/driver_executable.gni")
 
+tablegen("Opts") {
+  visibility = [ ":llvm-cgdata" ]
+  args = [ "-gen-opt-parser-defs" ]
+}
+
 driver_executable("llvm-cgdata") {
   deps = [
+    ":Opts",
     "//llvm/lib/CGData",
     "//llvm/lib/CodeGen",
     "//llvm/lib/IR",
     "//llvm/lib/Object",
+    "//llvm/lib/Option",
     "//llvm/lib/Support",
   ]
   sources = [ "llvm-cgdata.cpp" ]