Source map support (#429)

This change increases size:
out/debug/obj/libdeno/from_snapshot.o  19M -> 34M
out/release/deno                       32M -> 47M

1 files changed, 1 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index bab200547..b200c2cfe 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -264,6 +264,7 @@ rust_flatbuffer("msg_rs") {
 # Generates $target_gen_dir/snapshot_deno.cc
 create_snapshot("deno") {
   js = "$target_gen_dir/bundle/main.js"
+  source_map = "$target_gen_dir/bundle/main.js.map"
   deps = [
     ":bundle",
   ]