Theresa Rebeck’s “Bernhardt/Hamlet” is a backstage comedy-drama of historical fiction recounting Sarah Bernhardt’s groundbreaking 1897 turn as Hamlet in Paris; discursive, incoherent, and verbose, the play has nothing particularly interesting to say about gender politics as it ambitiously attempts to tackle a panoply of themes and ideas.  I’d much rather see Ms. McTeer play Hamlet than watch an endless series of rehearsals.