[cfe] Fix git access in presubmit script on Windows

Change-Id: I6c871264dc1fff39b19421ce1f5513eb2e56901d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/163061
Reviewed-by: Jens Johansen <jensj@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>

pkg/front_end/lib/src/fasta/source/source_library_builder.dart

@@ -1903,7 +1903,9 @@ class SourceLibraryBuilder extends LibraryBuilderImpl {
           isMixinDeclaration ? null : supertype,
           isNamedMixinApplication
               ? interfaces
-              : isMixinDeclaration ? [supertype, mixin] : null,
+              : isMixinDeclaration
+                  ? [supertype, mixin]
+                  : null,
           null, // No `on` clause types.
           new Scope(
               local: <String, MemberBuilder>{},

pkg/front_end/test/testing_utils.dart

@@ -2,7 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:io' show Platform, Process, ProcessResult;
+import 'dart:io' show Directory, Process, ProcessResult;
 
 import 'package:testing/testing.dart' show Chain, TestDescription;
 
@@ -21,9 +21,9 @@ Stream<TestDescription> filterList(
 }
 
 Future<Set<Uri>> getGitFiles(Chain suite) async {
-  ProcessResult result = await Process.run(
-      Platform.isWindows ? "git.bat" : "git", ["ls-files", "."],
-      workingDirectory: suite.uri.path);
+  ProcessResult result = await Process.run("git", ["ls-files", "."],
+      workingDirectory: new Directory.fromUri(suite.uri).absolute.path,
+      runInShell: true);
   String stdout = result.stdout;
   return stdout
       .split(new RegExp('^', multiLine: true))

pkg/kernel/lib/transformations/mixin_full_resolution.dart

@@ -325,7 +325,9 @@ class SuperCallResolutionTransformer extends Transformer {
         hierarchy.getDispatchTarget(lookupClass, new Name("noSuchMethod"));
     String methodNameUsed = (isGetter)
         ? "get:$methodName"
-        : (isSetter) ? "set:$methodName=" : methodName;
+        : (isSetter)
+            ? "set:$methodName="
+            : methodName;
     if (noSuchMethod != null &&
         noSuchMethod.function.positionalParameters.length == 1 &&
         noSuchMethod.function.namedParameters.isEmpty) {

pkg/vm/lib/transformations/ffi_definitions.dart

@@ -406,7 +406,9 @@ class _FfiDefinitionTransformer extends FfiTransformer {
     //   _fromAddress<Int8>(_loadIntPtr(pointer, offset));
     final loadMethod = isPointer
         ? loadMethods[NativeType.kIntptr]
-        : optimizedTypes.contains(type) ? loadMethods[type] : loadStructMethod;
+        : optimizedTypes.contains(type)
+            ? loadMethods[type]
+            : loadStructMethod;
     Expression getterReturnValue = StaticInvocation(
         loadMethod,
         Arguments([