Revert "Enable Dart compressed pointers for 64-bit mobile targets (#27975)" (#28091)
Revert "Enable Dart compressed pointers for 64-bit mobile targets (#27975)" (#28091)

This reverts commit d856fc33baf1a93feac8aa2369de1d139907bc4e.
rmacnak-google/engine,aam/engine,chinmaygarde/flutter_engine,Hixie/sky_engine,jason-simmons/flutter_engine,flutter/engine,jason-simmons/flutter_engine,Hixie/sky_engine,aam/engine,aam/engine,devoncarew/engine,jason-simmons/flutter_engine,rmacnak-google/engine,aam/engine,flutter/engine,Hixie/sky_engine,flutter/engine,jason-simmons/flutter_engine,flutter/engine,chinmaygarde/flutter_engine,Hixie/sky_engine,aam/engine,flutter/engine,chinmaygarde/flutter_engine,rmacnak-google/engine,chinmaygarde/flutter_engine,devoncarew/engine,devoncarew/engine,jason-simmons/flutter_engine,devoncarew/engine,Hixie/sky_engine,flutter/engine,flutter/engine,Hixie/sky_engine,aam/engine,devoncarew/engine,jason-simmons/flutter_engine,rmacnak-google/engine,aam/engine,chinmaygarde/flutter_engine,rmacnak-google/engine,rmacnak-google/engine,chinmaygarde/flutter_engine,jason-simmons/flutter_engine,flutter/engine,Hixie/sky_engine,rmacnak-google/engine,chinmaygarde/flutter_engine,devoncarew/engine,jason-simmons/flutter_engine,Hixie/sky_engine,devoncarew/engine,aam/engine