Fixes to incremental DDK/blaze

This CL fixes a number of issues:
* Semi-leaking old components when starting over
  (i.e. when loading a new sdk)
* Setting new filesystem not really working because the old one was
  cached in the ProcessedOptions
* Leaking old state because of an apparent VM bug (http://dartbug.com/36983)

Change-Id: Ib124257c456b019941e253409c1ef56eedcf66b2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103121
Reviewed-by: Kevin Millikin <kmillikin@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>

https://dart.googlesource.com/sdk/+/2bbb6aae9bb7a14a8177463bcb5a857e635978df
diff --git a/commits.json b/commits.json
index 3cfeefe..36ce582 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"301f560bd835e462134b491f1d5a74d21d03f3a8",
   "external/github.com/flutter/flutter":"d5aae54a28a2ba04f5737752edba9f5c98259c6c",
-  "sdk":"e7f79849953d8f85243cda71d8337f2054241c0a"
+  "sdk":"2bbb6aae9bb7a14a8177463bcb5a857e635978df"
 }
\ No newline at end of file