Permit non-ASCII identifiers in JS

* lisp/progmodes/js.el (js--name-start-re): Generally allow
identifiers to begin with non-ASCII letters.  This is of particular
importance to JSX parsing.

* test/manual/indent/jsx-unclosed-2.jsx: Add test to ensure non-ASCII
characters are parsed properly.
1 job for feature/jsx in 52 minutes and 26 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test
failed #1264
test-all

00:52:26

 
Name Stage Failure
failed
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:313: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:288: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:962: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1