[vm/compiler] Move runtime call of InitInstanceField out into a Stub

If the runtime causes a deoptimization of the frame it expects
the deopt environment to reflect the stack of unoptimized code (without
additional pushed objects).

Issue https://github.com/dart-lang/sdk/issues/40753

Change-Id: I6c7bebc53ce82f5d18cf94e1c95ddebd943efa8c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/141980
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Tess Strickland <sstrickl@google.com>

https://dart.googlesource.com/sdk/+/d6a096cb03f45119876ab0dbde7c445bf635bcb1
diff --git a/commits.json b/commits.json
index 6df068c..5bdae1a 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"bcc144d0d138cf1f2abe198c1108367c114e8da4",
   "external/github.com/flutter/flutter":"587b622396110444492943a74bb7c0cdcf4b3fa2",
-  "sdk":"eea97179386a9ced7d68452cea158345f4019baa"
+  "sdk":"d6a096cb03f45119876ab0dbde7c445bf635bcb1"
 }
\ No newline at end of file