Fix Dart 2 reload when running from a snapshot instead of platform.dill. (#5792)
Fix Dart 2 reload when running from a snapshot instead of platform.dill. (#5792)

Without this flag, the VM will attempt to interpret a kernel file as source code.

Affects Fuchsia (FL-71) and code-push.
rmacnak-google/engine,rmacnak-google/engine,jamesr/sky_engine,flutter/engine,rmacnak-google/engine,jamesr/sky_engine,jamesr/sky_engine,devoncarew/sky_engine,jamesr/flutter_engine,mikejurka/engine,flutter/engine,jamesr/sky_engine,cdotstout/sky_engine,flutter/engine,tvolkert/engine,chinmaygarde/sky_engine,jason-simmons/sky_engine,mikejurka/engine,jason-simmons/flutter_engine,aam/engine,jason-simmons/flutter_engine,jason-simmons/sky_engine,tvolkert/engine,aam/engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,cdotstout/sky_engine,mikejurka/engine,cdotstout/sky_engine,tvolkert/engine,devoncarew/sky_engine,jason-simmons/flutter_engine,krisgiesing/sky_engine,chinmaygarde/flutter_engine,devoncarew/sky_engine,devoncarew/engine,mikejurka/engine,Hixie/sky_engine,mikejurka/engine,jason-simmons/flutter_engine,devoncarew/engine,rmacnak-google/engine,mikejurka/engine,aam/engine,jamesr/sky_engine,chinmaygarde/flutter_engine,aam/engine,cdotstout/sky_engine,rmacnak-google/engine,chinmaygarde/flutter_engine,devoncarew/sky_engine,jamesr/sky_engine,rmacnak-google/engine,jamesr/flutter_engine,Hixie/sky_engine,devoncarew/sky_engine,jamesr/flutter_engine,devoncarew/sky_engine,Hixie/sky_engine,jason-simmons/flutter_engine,mikejurka/engine,cdotstout/sky_engine,Hixie/sky_engine,jason-simmons/flutter_engine,jamesr/flutter_engine,chinmaygarde/flutter_engine,devoncarew/engine,jamesr/flutter_engine,rmacnak-google/engine,chinmaygarde/sky_engine,krisgiesing/sky_engine,jamesr/sky_engine,krisgiesing/sky_engine,mikejurka/engine,tvolkert/engine,devoncarew/sky_engine,jason-simmons/sky_engine,tvolkert/engine,jamesr/flutter_engine,krisgiesing/sky_engine,aam/engine,jamesr/flutter_engine,mikejurka/engine,krisgiesing/sky_engine,devoncarew/engine,aam/engine,jamesr/flutter_engine,chinmaygarde/sky_engine,flutter/engine,jason-simmons/flutter_engine,jamesr/flutter_engine,jason-simmons/sky_engine,chinmaygarde/flutter_engine,devoncarew/engine,devoncarew/engine,chinmaygarde/sky_engine,Hixie/sky_engine,cdotstout/sky_engine,flutter/engine,chinmaygarde/sky_engine,Hixie/sky_engine,tvolkert/engine,krisgiesing/sky_engine,jason-simmons/sky_engine,jason-simmons/flutter_engine,jason-simmons/sky_engine,aam/engine,chinmaygarde/flutter_engine,chinmaygarde/sky_engine,flutter/engine,devoncarew/engine,flutter/engine,cdotstout/sky_engine,Hixie/sky_engine,Hixie/sky_engine,flutter/engine,chinmaygarde/sky_engine,krisgiesing/sky_engine,tvolkert/engine,aam/engine