[ES6] Add tests for const for-loop interation scope
[ES6] Add tests for const for-loop interation scope

Fixes #571

Delapouite/compat-table,mzgol/compat-table,KTamas/compat-table,natorion/compat-table,Delapouite/compat-table,gskachkov/compat-table,gskachkov/compat-table,natorion/compat-table,mzgol/compat-table,KTamas/compat-table