Factorize to use [lident] rule
Factorize to use [lident] rule

This has the nice side-effect that now [rhs parseState 1] is called in
[lident], which is a proper (i.e. non-inlined) production
rule. Otherwise, the inlining of [lidentOrOperator] was inlining the
call to [rhs parseState 1] as well, which lead to bad ranges.

FStarLang/FStar,FStarLang/FStar,FStarLang/FStar