Roll src/third_party/dart ec5ba8a252..601094e3f2 (7 commits)

601094e3f2 [vm/bytecode] Fix max used block id when compiling from bytecode
ff2e8eb681 [vm, gc] Fix backwards write-barrier logic used by Object::Clone.
1ba59eb13d Make ERROR the default severity for StaticWarningCode. Remove _StrongModeTypeErrorProcessor.
fc417a73ed [vm/compiler] Disable max block id check (for now)
e02399da33 [vm/compiler] Introduce graph checker
2881a92c4e [vm/compiler] Fix missing incremental DOM update
95b017a888 Implement changeFile() and recompute available libraries and declarations.

DEPS

@@ -31,7 +31,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'ec5ba8a2521a3638c39cc41a09ce736ed64cd092',
+  'dart_revision': '601094e3f26554a57b80382b7c32afa196484663',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

-Signature: f8265c6642639361478b6d5eb536250d
+Signature: c4dd2593c6aa82c2072f0ec673277a9a
 
 UNUSED LICENSES:
 
@@ -5605,6 +5605,8 @@ TYPE: LicenseType.bsd
 FILE: ../../../third_party/dart/runtime/bin/namespace_fuchsia.h
 FILE: ../../../third_party/dart/runtime/vm/class_id.h
 FILE: ../../../third_party/dart/runtime/vm/code_entry_kind.h
+FILE: ../../../third_party/dart/runtime/vm/compiler/backend/flow_graph_checker.cc
+FILE: ../../../third_party/dart/runtime/vm/compiler/backend/flow_graph_checker.h
 FILE: ../../../third_party/dart/runtime/vm/compiler/backend/slot_test.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/relocation.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/runtime_api.cc