allow "nonreentrant" on view functions

[charles-cooper]

on view functions, the sstores are not issued, but the sload check is

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[codecov-commenter]

Codecov Report

Merging #2921 (294ed3b) into master (4e38ec4) will decrease coverage by 0.01%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #2921      +/-   ##
==========================================
- Coverage   88.47%   88.46%   -0.02%     
==========================================
  Files          97       97              
  Lines       10613    10616       +3     
  Branches     2527     2528       +1     
==========================================
+ Hits         9390     9391       +1     
- Misses        770      771       +1     
- Partials      453      454       +1     

Impacted Files	Coverage Δ
vyper/codegen/function_definitions/utils.py	80.00% <66.66%> (-20.00%)	⬇️
vyper/semantics/types/function.py	87.12% <100.00%> (ø)

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[fubuloubu]

Needs tests

[charles-cooper]

Needs tests

see 294ed3b