Enable generation of instruction buffer on precompilation

runtime/BUILD.gn

Index: runtime/BUILD.gn
diff --git a/runtime/BUILD.gn b/runtime/BUILD.gn
index cbc064398d7b5fa50dbc9cb7073622e376fa502e..60805f97dd8e4e629ff4a1fd47e2a8253059132e 100644
--- a/runtime/BUILD.gn
+++ b/runtime/BUILD.gn
@@ -21,6 +21,12 @@ config("dart_public_config") {
 
 config("dart_config") {
   defines = []
+  if (target_os == "ios") {
+    # For precompilation, we need to set the target architecture when we
+    # compile the snapshotter on the host. If no instruction buffer is created

[rmacnak, 2015/10/22 16:46:15]

The snapshotter is osx not ios.

It would be better to use an explicit flag for this rather than have every GN
build of a OSX VM using a simulator.

[Chinmay, 2015/10/22 19:01:29]

ack

+    # on the host, this argument is of no consequence.
+    defines += ["TARGET_ARCH_ARM64"]
+  }
   if (dart_debug) {
     defines += ["DEBUG"]
   } else {