[gn] port 5a0be9b

Author: nico

llvm/utils/gn/secondary/llvm/lib/Target/Hexagon/Disassembler/BUILD.gn

@@ -2,10 +2,7 @@ import("//llvm/utils/TableGen/tablegen.gni")
 
 tablegen("HexagonGenDisassemblerTables") {
   visibility = [ ":Disassembler" ]
-  args = [
-    "-gen-disassembler",
-    "-ignore-non-decodable-operands",
-  ]
+  args = [ "-gen-disassembler" ]
   td_file = "../Hexagon.td"
 }