chore: add asm option to cli help

[pcaversaccio]

What I did

As title.

Commit message

chore: add `asm` option to cli help

Description for the changelog

N/A.

Cute Animal Picture

[codecov-commenter]

Codecov Report

Merging #3585 (96f1e86) into master (2c21eab) will decrease coverage by 1.46%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3585      +/-   ##
==========================================
- Coverage   89.05%   87.60%   -1.46%     
==========================================
  Files          85       85              
  Lines       11378    11826     +448     
  Branches     2586     2734     +148     
==========================================
+ Hits        10133    10360     +227     
- Misses        821     1038     +217     
- Partials      424      428       +4     

Files Changed	Coverage Δ
vyper/ast/pre_parser.py	84.78% <ø> (ø)
vyper/cli/vyper_compile.py	63.57% <ø> (ø)

... and 1 file with indirect coverage changes

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