Remove 'use strict' directive when not needed, split tests which have different strict mode semantics
Remove 'use strict' directive when not needed, split tests which have different strict mode semantics

anba/es6draft,jugglinmike/es6draft,jugglinmike/es6draft,jugglinmike/es6draft,jugglinmike/es6draft,anba/es6draft,anba/es6draft