Supporting ImplicitValueInitExpr. Fixes #424

[Konstantin8105]

Close #424
See #67

---

This change is 

[codecov]

Codecov Report

Merging #454 into master will decrease coverage by 0.01%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #454      +/-   ##
==========================================
- Coverage    81.1%   81.09%   -0.02%     
==========================================
  Files         145      145              
  Lines        6511     6527      +16     
==========================================
+ Hits         5281     5293      +12     
- Misses        968      970       +2     
- Partials      262      264       +2

Impacted Files	Coverage Δ
transpiler/transpiler.go	82.9% <75%> (-0.44%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a1fdac7...1af9581. Read the comment docs.

[elliotchance]

Reviewed 2 of 2 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved.

---

Comments from Reviewable