avoid transforming side effecty member expression checks[fix #469]

[vigneshshanmugam]

• this transform happens on simplify as well.. So the issue itself is not resolved.

fix #469

Just keeping it here so that we can remove it from one place and apply this fix.

[codecov]

Codecov Report

Merging #506 into master will decrease coverage by 0.06%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #506      +/-   ##
==========================================
- Coverage   82.64%   82.57%   -0.07%     
==========================================
  Files          35       35              
  Lines        2633     2652      +19     
  Branches      924      931       +7     
==========================================
+ Hits         2176     2190      +14     
- Misses        279      282       +3     
- Partials      178      180       +2

Impacted Files	Coverage Δ
...bel-plugin-minify-guarded-expressions/src/index.js	70.49% <75%> (+1.44%)	⬆️

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[vigneshshanmugam]

@boopathi Does this still happen? Can we merge or close this since we need this for 1.0 milestone