Add portable Windows build and update GC runtime

tools/scan_gc_notes.py

@@ -72,6 +72,9 @@ def main() -> int:
     override_count = 0
     overrides = collections.Counter()
     note_count = 0
+    fly_in_count = 0
+    fly_trail_count = 0
+    fly_bounce_count = 0
     samples = {}
     failures = []
     for path in paths:
@@ -89,6 +92,12 @@ def main() -> int:
             if note[2] != 0:
                 overrides[(raw_type, note[2])] += 1
             samples.setdefault(raw_type, (path, note))
+            flag37 = note[16]
+            flag38 = note[17]
+            cycles = note[24]
+            fly_in_count += flag37 != 0
+            fly_trail_count += flag38 != 0
+            fly_bounce_count += flag37 != 0 and cycles != 0
 
     print(f"record_size={NOTE.size}")
     print(f"files={len(paths)} valid={len(paths) - len(failures)} invalid={len(failures)} notes={note_count}")
@@ -98,6 +107,7 @@ def main() -> int:
         for key, value in sorted(types.items())
     ))
     print(f"type_override_nonzero={override_count}")
+    print(f"fly_in={fly_in_count} fly_trail={fly_trail_count} fly_bounce={fly_bounce_count}")
     print("overrides=" + " ".join(
         f"0x{raw:02x}/0x{override:02x}:{count}"
         for (raw, override), count in sorted(overrides.items())