JavaScript: skip static blocks

[masatake]

Close #3948

I wonder what I should do for v in

class a {
    static { let v = 1; }
    fld;
}

What should we put in the scope field of v?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.37%. Comparing base (988b890) to head (c433018). Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3949   +/-   ##
=======================================
  Coverage   85.37%   85.37%           
=======================================
  Files         235      235           
  Lines       56451    56458    +7     
=======================================
+ Hits        48193    48200    +7     
  Misses       8258     8258           

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