[vm] Fix uninitialized Code::instructions_ during deferred loading.

TEST=ci
Bug: https://github.com/dart-lang/sdk/issues/59905
Bug: https://github.com/dart-lang/sdk/issues/60035
Change-Id: I733ee43f4e5e48ffa8eeb357de543233a1887b4a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/407601
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Brian Quinlan <bquinlan@google.com>

https://dart.googlesource.com/sdk/+/fb0cac7375664e8204ad831af92bedbb79d4ca52

DEPS

diff --git a/DEPS b/DEPS
index b4d77e1..4acf455 100644
--- a/DEPS
+++ b/DEPS
@@ -237,7 +237,7 @@
 ]
 
 deps = {
-  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '2e13d4d95498a586df8a5b7ce984640902d76c4a',
+  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + 'fb0cac7375664e8204ad831af92bedbb79d4ca52',
 
   'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '53e7e99c52755829b3b856372b0d96809833f576',
 

commits.json

diff --git a/commits.json b/commits.json
index 92a4411..8748687 100644
--- a/commits.json
+++ b/commits.json
@@ -1,4 +1,4 @@
 {
   "flutter":"53e7e99c52755829b3b856372b0d96809833f576",
-  "flutter/engine/src/flutter/third_party/dart":"2e13d4d95498a586df8a5b7ce984640902d76c4a"
+  "flutter/engine/src/flutter/third_party/dart":"fb0cac7375664e8204ad831af92bedbb79d4ca52"
 }
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