[r mode] Use a bitfield for lexical alignment info
[r mode] Use a bitfield for lexical alignment info

Issue #4603

MarcelGerber/CodeMirror,schanzer/CodeMirror,grzegorzmazur/CodeMirror,pabloferz/CodeMirror,mtaran-google/CodeMirror,wingify/CodeMirror,codio/CodeMirror,crazy4chrissi/CodeMirror,namin/CodeMirror,notepadqq/CodeMirror,thomasjm/CodeMirror,wingify/CodeMirror,jayaprabhakar/CodeMirror,pabloferz/CodeMirror,jkaplon/CodeMirror,dperetti/CodeMirror,jayaprabhakar/CodeMirror,schanzer/CodeMirror,jkaplon/CodeMirror,ficristo/CodeMirror,codio/CodeMirror,SidPresse/CodeMirror,ejgallego/CodeMirror,kerabromsmu/CodeMirror,MarcelGerber/CodeMirror,thomasjm/CodeMirror,schanzer/CodeMirror,namin/CodeMirror,ficristo/CodeMirror,jkaplon/CodeMirror,hackmdio/CodeMirror,jayaprabhakar/CodeMirror,dperetti/CodeMirror,crazy4chrissi/CodeMirror,ficristo/CodeMirror,crazy4chrissi/CodeMirror,namin/CodeMirror,pabloferz/CodeMirror,dperetti/CodeMirror,grzegorzmazur/CodeMirror,notepadqq/CodeMirror,codio/CodeMirror,hackmdio/CodeMirror,grzegorzmazur/CodeMirror,kerabromsmu/CodeMirror,ejgallego/CodeMirror,mtaran-google/CodeMirror,MarcelGerber/CodeMirror,SidPresse/CodeMirror,kerabromsmu/CodeMirror,nightwing/CodeMirror,thomasjm/CodeMirror,ejgallego/CodeMirror,SidPresse/CodeMirror,nightwing/CodeMirror,mtaran-google/CodeMirror,wingify/CodeMirror,notepadqq/CodeMirror,hackmdio/CodeMirror,nightwing/CodeMirror