fix: generate separate function names depending on context

[charles-cooper]

What I did

for backends which only have a single compilation context (i.e., they do not split initcode and runtime code like EVM), they need separate names for the two different codes generated per-function as of c202c4e. this is also hygienic - since the two functions actually have different codes as of c202c4e, give them different names.

How I did it

How to verify it

Commit message

for backends (like zksync) which only have a single compilation context
(i.e., they do not split initcode and runtime code like EVM), they need
separate names for the two different codes generated per-function as of
c202c4e3ec8. this is also hygienic - since the two functions actually
have different codes as of c202c4e3ec8, give them different names.

Description for the changelog

Cute Animal Picture

[codecov-commenter]

Codecov Report

Merging #3423 (4e0602d) into master (3837ad3) will increase coverage by 0.12%.
The diff coverage is 100.00%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@            Coverage Diff             @@
##           master    #3423      +/-   ##
==========================================
+ Coverage   89.05%   89.17%   +0.12%     
==========================================
  Files          84       84              
  Lines       10760    10761       +1     
  Branches     2452     2451       -1     
==========================================
+ Hits         9582     9596      +14     
+ Misses        784      771      -13     
  Partials      394      394              

Impacted Files	Coverage Δ
vyper/codegen/function_definitions/common.py	97.40% <100.00%> (ø)
.../codegen/function_definitions/internal_function.py	100.00% <100.00%> (ø)
vyper/codegen/self_call.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more