[vm,dyn_modules] Fix capturing of 'this' in instance field initializers

TEST=ci (co19/Language/Classes/access_to_this_A01_t02)

Change-Id: If08c23cdc2d751e76d63d81f6aad511cd2a31fae
Cq-Include-Trybots: luci.dart.try:vm-aot-dyn-linux-debug-x64-try,vm-aot-dyn-linux-product-x64-try,vm-dyn-linux-debug-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/443635
Reviewed-by: Tess Strickland <sstrickl@google.com>
Reviewed-by: Slava Egorov <vegorov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>

pkg/dart2bytecode/lib/local_vars.dart

@@ -936,6 +936,7 @@ class _Allocator extends RecursiveVisitor {
         _allocateParameter(_currentFrame.receiverVar!, 0);
         if (_currentFrame.capturedReceiverVar != null) {
           _allocateVariable(_currentFrame.capturedReceiverVar!);
+          _currentFrame.hasCapturedParameters = true;
         }
       }
       _allocateSpecialVariables();