GN: Fix armsimdbc target. Add armsimdbc64

runtime/BUILD.gn

Index: runtime/BUILD.gn
diff --git a/runtime/BUILD.gn b/runtime/BUILD.gn
index 8556ba29f8019358f4fd385707bc430ae39e2a93..6008aecabad0430312d83ca6f0f48e5cbc0a6c30 100644
--- a/runtime/BUILD.gn
+++ b/runtime/BUILD.gn
@@ -129,11 +129,13 @@ config("dart_config") {
     } else if (dart_target_arch == "ia32") {
       defines += [ "TARGET_ARCH_IA32" ]
     } else if (dart_target_arch == "dbc" || dart_target_arch == "simdbc" ||
-               dart_target_arch == "simdbc64") {
+               dart_target_arch == "simdbc64" ||
+               dart_target_arch == "armsimdbc" ||
+               dart_target_arch == "armsimdbc64") {
       defines += [ "TARGET_ARCH_DBC" ]
       defines += [ "USING_SIMULATOR" ]
     } else {
-      print("Invalid |dart_target_arch|")
+      print("Invalid $dart_target_arch")
       assert(false)
     }
   }