make all opcodes proper type

[ucwong]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.93%. Comparing base (432a8ff) to head (023e203).
Report is 318 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2233      +/-   ##
==========================================
+ Coverage   46.92%   46.93%   +0.01%     
==========================================
  Files         571      571              
  Lines       67997    68001       +4     
==========================================
+ Hits        31908    31918      +10     
+ Misses      33668    33660       -8     
- Partials     2421     2423       +2     

Files with missing lines	Coverage Δ
core/vm/opcodes.go	0.00% <ø> (ø)

... and 10 files with indirect coverage changes