Rename hostSupportEvalConstInStrictMode() to allowEvaluatedConstInStrictMode() and refactoring.

Closure is not necessary here.
Bugs in declaring temporaries and handling CALL expression nodes.

See https://github.com/RiverTrail/RiverTrail/commit/666c3ae346e2a9f0f1e2e4081b26c933608d7b91
Merge pull request #9 from hujiajie/master

jslib update