Try fixing wasm-opt errors

[andrewdavidmackenzie]

Seems that a new flag is needed

Ref: WebAssembly/wasi-sdk#254

[codecov]

Codecov Report

Attention: Patch coverage is 96.87500% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88%. Comparing base (205497b) to head (34a27b3).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
flowc/src/lib/compiler/compile_wasm.rs	97%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #2389   +/-   ##
======================================
- Coverage      88%     88%   -0%     
======================================
  Files         150     150           
  Lines       18516   18536   +20     
======================================
+ Hits        16171   16181   +10     
- Misses       2345    2355   +10     

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