[CFE] Fix incremental serialization bug caused by missing parameter passing

When implemention the incremental serializer, I forgot to pass it on in
the incremental kernel generators "IncrementalKernelGenerator.fromComponent"
and only did it in "IncrementalKernelGenerator", meaning that when using
"IncrementalKernelGenerator.fromComponent" the incremental serializer wasn't
used properly, namely nothing got invalidated.
Now it gets passed correctly, things get invalidated and everything should
be fine.

Fixes flutter/flutter#44384.

Change-Id: Ic2e7f7330dc6ee62dd8e7bf6684d7bee8ee328bb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/124684
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>

Author: jensjoha

pkg/front_end/lib/src/api_prototype/incremental_kernel_generator.dart

@@ -50,7 +50,8 @@ abstract class IncrementalKernelGenerator {
         new CompilerContext(
             new ProcessedOptions(options: options, inputs: [entryPoint])),
         component,
-        outlineOnly);
+        outlineOnly,
+        incrementalSerializer);
   }
 
   /// Returns a component whose libraries are the recompiled libraries,