[javascript mode] Fix parsing of import.meta
[javascript mode] Fix parsing of import.meta

Closes #6603

nightwing/CodeMirror,hackmdio/CodeMirror,pabloferz/CodeMirror,hackmdio/CodeMirror,hackmdio/CodeMirror,nightwing/CodeMirror,dperetti/CodeMirror,nightwing/CodeMirror,wingify/CodeMirror,wingify/CodeMirror,dperetti/CodeMirror,pabloferz/CodeMirror,pabloferz/CodeMirror,wingify/CodeMirror,dperetti/CodeMirror