[ddc] Avoid passing previous dill for standalone hot restart tests

A hot restart should create a fresh compile and reset the chain of
history for hot reload changes. In the "standalone" test suite
(without the use of the frontend server) this should be achieved by
not passing the previous .dill file when compiling with DDC.

Change-Id: If729e62d3f65fd263d5b40d5dad9a5d4ed0d5839
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/450184
Reviewed-by: Nate Biggs <[email protected]>
Commit-Queue: Nicholas Shahan <[email protected]>

Author: nshahan

pkg/dev_compiler/test/hot_reload_suite.dart

@@ -1251,7 +1251,10 @@ abstract class DdcStandaloneSuiteRunner
         .path;
   }
 
-  List<String> _getDdcArguments(String deltaKernelPath, bool recompile) {
+  List<String> _getDdcArguments(
+    String deltaKernelPath,
+    bool recompileForHotReload,
+  ) {
     return [
       '--modules=ddc',
       '--canary',
@@ -1262,7 +1265,7 @@ abstract class DdcStandaloneSuiteRunner
       '--multi-root-scheme=$filesystemScheme',
       '--experimental-output-compiled-kernel',
       '--experimental-emit-debug-metadata',
-      if (recompile && acceptedDill != null)
+      if (recompileForHotReload && acceptedDill != null)
         '--reload-last-accepted-kernel=$acceptedDill',
       '-o',
       emittedFilesDir.uri.resolve('out.js').path,
@@ -1295,7 +1298,10 @@ abstract class DdcStandaloneSuiteRunner
     final deltaKernelPath = _createDeltaKernelPath(generation);
     final response = await controller.doWork(
       WorkRequest(
-        arguments: _getDdcArguments(deltaKernelPath, true),
+        arguments: _getDdcArguments(
+          deltaKernelPath,
+          !test.isHotRestart[generation]!,
+        ),
         inputs: [Input(path: deltaKernelPath)],
       ),
     );