Split global analysis and backend in dart2js pipeline tests

Change-Id: I99c1464f7fb58f5edd9f726c86f29832cce2e6f0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103001
Commit-Queue: Sigmund Cherem <sigmund@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>

https://dart.googlesource.com/sdk/+/2a85d595ba5541c01d3fd8961c929f9ac4695597
diff --git a/commits.json b/commits.json
index e78b9b3..f104079 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"3d2e9b24aa712ba60206e7ac392a709df0939635",
   "external/github.com/flutter/flutter":"d0c603d0bbf8898038f620fe47c3552ece07fd65",
-  "sdk":"0c2738f616baad87b51861ead512b9c0a4dbcb8e"
+  "sdk":"2a85d595ba5541c01d3fd8961c929f9ac4695597"
 }
\ No newline at end of file