Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/build/preserves_htaccess_test.dart

Index: sdk/lib/_internal/pub_generated/test/build/preserves_htaccess_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/build/preserves_htaccess_test.dart b/sdk/lib/_internal/pub_generated/test/build/preserves_htaccess_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..645e5ace6f4ce600f9871c1ec8450e6cbc7f3ff1
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/test/build/preserves_htaccess_test.dart
@@ -0,0 +1,26 @@
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+main() {
+  initConfig();
+  integration("preserves .htaccess as a special case", () {
+    d.dir(
+        appPath,
+        [
+            d.appPubspec(),
+            d.dir(
+                'web',
+                [d.file('.htaccess', 'fblthp'), d.file('.hidden', 'asdfgh')])]).create();
+    schedulePub(
+        args: ["build"],
+        output: new RegExp(r'Built \d+ files? to "build".'));
+    d.dir(
+        appPath,
+        [
+            d.dir(
+                'build',
+                [
+                    d.dir(
+                        'web',
+                        [d.file('.htaccess', 'fblthp'), d.nothing('.hidden')])])]).validate();
+  });
+}