Fix type conversion related to as_u*

[zjb0807]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 61.32%. Comparing base (c61d548) to head (ed66d6a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
modules/evm/src/runner/stack.rs	0.00%	3 Missing ⚠️
modules/evm-bridge/src/lib.rs	87.50%	1 Missing ⚠️
modules/evm/src/precompiles/modexp.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2847      +/-   ##
==========================================
- Coverage   61.42%   61.32%   -0.10%     
==========================================
  Files          67       67              
  Lines        9428     9218     -210     
==========================================
- Hits         5791     5653     -138     
+ Misses       3637     3565      -72     

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