Roll Dart SDK 78ce916..15a3bf8 (#10810)

15a3bf8 Add defined() guard for checkout_llvm build flag
d5d00c8 Create ExtensionMemberResolver instance in ResolverVisitor.
9ec8d9f [ddc] Merge modular/issue37523 test into modular/nested_constants test
ea313da Rework the resolution result
ab55923 [dartdevc] ddb fix for d8
77f545b [vm/ffi] Fix instantiation and garbage collection of NativeType objects
b0d079a Set context type for extension override receiver.
dc2c942 [vm/bytecode] Avoid adding all ICData objects from constant pool
804a338 Change recordScopeDependencies() to return true on type parameter of strict FunctionType.
0c72742 Stop reporting undefined method when there are ambiguous extension methods
6d29025 Emit a server.error event if we fail to start the completion model isolate
51f4574 Reland "[vm/ffi] Support structs on 32bit architectures"
621b96f Migration: begin adding infrastructure for reporting unsatisfiable substitutions.
19654f3 [cfe+vm+ddc] Return ClassHierarchy and CoreTypes together with Component
573789f [cfe] Insert default super initializer when outlining const constructor

DEPS

@@ -34,7 +34,7 @@ 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': '78ce916d8219457c872183ce89c594b045891b48',
+  'dart_revision': '15a3bf82cbd67c2d73e9f6a46ec6a3e32d8229eb',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: 8b065bff7ffd2927337a7a8d8453f7b1
+Signature: 72ff7af9d28bb2fdd1ca30b84a823cb3
 
 UNUSED LICENSES:
 

web_sdk/flutter_kernel_sdk.dart

@@ -18,7 +18,7 @@ import 'package:dev_compiler/src/kernel/compiler.dart';
 import 'package:front_end/src/api_unstable/ddc.dart'
     show
         CompilerOptions,
-        kernelForComponent,
+        kernelForModule,
         DiagnosticMessage,
         printDiagnosticMessage,
         Severity;
@@ -67,15 +67,16 @@ Future main(List<String> args) async {
     ..environmentDefines = {};
 
   var inputs = target.extraRequiredLibraries.map(Uri.parse).toList();
-  var component = await kernelForComponent(inputs, options);
+  var compilerResult = await kernelForModule(inputs, options);
+  var component = compilerResult.component;
 
   var outputDir = path.dirname(outputPath);
   await Directory(outputDir).create(recursive: true);
   await writeComponentToBinary(component, outputPath);
 
   var jsModule = ProgramCompiler(
       component,
-      target.hierarchy,
+      compilerResult.classHierarchy,
       SharedCompilerOptions(moduleName: 'dart_sdk'),
       {}).emitModule(component, [], [], {});
   var moduleFormats = {