Fix resolver and block_scoping

[kdy1]

Closes #698.
Closes #699.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@165a209). Click here to learn what that means.
The diff coverage is 47.36%.

@@            Coverage Diff            @@
##             master     #700   +/-   ##
=========================================
  Coverage          ?   23.73%           
=========================================
  Files             ?      200           
  Lines             ?    29777           
  Branches          ?     7612           
=========================================
  Hits              ?     7068           
  Misses            ?    20239           
  Partials          ?     2470

Impacted Files	Coverage Δ
ecmascript/transforms/src/resolver.rs	56.37% <ø> (ø)
...ript/transforms/src/compat/es2015/block_scoping.rs	53.58% <47.36%> (ø)

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