[gn] port 6512a8d more

24293e690 added the files added there, but didn't do the tblgen changes.

llvm/utils/gn/secondary/llvm/lib/Target/SystemZ/MCTargetDesc/BUILD.gn

@@ -1,11 +1,20 @@
 import("//llvm/utils/TableGen/tablegen.gni")
 
-tablegen("SystemZGenAsmWriter") {
+tablegen("SystemZGenGNUAsmWriter") {
   visibility = [ ":MCTargetDesc" ]
   args = [ "-gen-asm-writer" ]
   td_file = "../SystemZ.td"
 }
 
+tablegen("SystemZGenHLAsmWriter") {
+  visibility = [ ":MCTargetDesc" ]
+  args = [
+    "-gen-asm-writer",
+    "-asmwriternum=1",
+  ]
+  td_file = "../SystemZ.td"
+}
+
 tablegen("SystemZGenInstrInfo") {
   visibility = [ ":MCTargetDesc" ]
   args = [ "-gen-instr-info" ]
@@ -42,7 +51,8 @@ static_library("MCTargetDesc") {
     ":SystemZGenSubtargetInfo",
   ]
   deps = [
-    ":SystemZGenAsmWriter",
+    ":SystemZGenGNUAsmWriter",
+    ":SystemZGenHLAsmWriter",
     ":SystemZGenMCCodeEmitter",
     "//llvm/lib/CodeGen",
     "//llvm/lib/MC",