use faster method to write to memory

[ucwong]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.92%. Comparing base (67a7460) to head (432a8ff).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2231      +/-   ##
==========================================
+ Coverage   46.91%   46.92%   +0.01%     
==========================================
  Files         570      571       +1     
  Lines       67921    67997      +76     
==========================================
+ Hits        31865    31908      +43     
- Misses      33642    33668      +26     
- Partials     2414     2421       +7     

Files with missing lines	Coverage Δ
core/vm/memory.go	39.72% <100.00%> (-0.82%)	⬇️

... and 11 files with indirect coverage changes