[gn build] Delete stale AttributesCompatFunc after D72455/cfe87a4a16b73652dc06f9fa334137656991f13f

Author: MaskRay

llvm/utils/gn/secondary/llvm/lib/IR/BUILD.gn

@@ -1,10 +1,5 @@
 import("//llvm/utils/TableGen/tablegen.gni")
 
-tablegen("AttributesCompatFunc") {
-  visibility = [ ":IR" ]
-  args = [ "-gen-attrs" ]
-}
-
 static_library("IR") {
   output_name = "LLVMCore"
   public_deps = [
@@ -13,7 +8,6 @@ static_library("IR") {
     "//llvm/include/llvm/IR:public_tablegen",
   ]
   deps = [
-    ":AttributesCompatFunc",
     "//llvm/include/llvm/IR:IntrinsicImpl",
     "//llvm/lib/BinaryFormat",
     "//llvm/lib/Remarks",