C++ Mode: Prevent End of statement being found after {} in "count << vec{} <<"

* lisp/progmodes/cc-engine.el (c-beginning-of-statement-1): Check for
operators which cannot start a statement, which may follow a closing brace.
Don't recognise an end of statement in such a case.

* lisp/progmodes/cc-langs.el (c-operator-re, c-bin-tern-operators)
(c-unary-operators, c-non-after-{}-operators, c-non-after-{}-ops-re): New lang
consts and vars.
1 job for master in 52 minutes and 17 seconds (queued for 4 seconds)
Status Job ID Name Coverage
failed #2916


Name Stage Failure
test-all Test
Makefile:318: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 2
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:959: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1