fix: memory allocation in certain builtins using msize

[charles-cooper]

What I did

fix for #3609

How I did it

How to verify it

Commit message

in certain builtins which use `msize` to allocate a buffer for their
arguments (specifically, `raw_call()`, `create_copy_of()` and
`create_from_blueprint()`), corruption of the buffer can occur when
`msize` is not properly initialized. (this usually happens when there
are no variables which are held in memory in the outer external
function). what can happen is that some arguments can be evaluated after
`msize` is evaluated, leading to overwriting the memory region for the
argument buffer with other arguments. specifically, combined with the
condition that `msize` is underinitialized, this can happen with:

- the buffer for the initcode of `create_copy_of()` and
  `create_from_blueprint()` can be overwritten when the `salt=` or
  `value=` arguments write to memory

- the buffer for the `data` argument (when `msg.data` is provided,
  prompting the use of `msize`) of `raw_call()` can be overwritten when
  the `to`, `gas=` or `value=` arguments write to memory

this commit fixes the issue by using a variant of `cache_when_complex()`
to ensure that the relevant arguments are evaluated before `msize` is
evaluated.

this is a patch for GHSA-c647-pxm2-c52w.

summarized changelog:
* fix raw_call
* test: raw_call with msg.data buffer clean memory
* force memory effects in some clean_mem tests
* add tests for clean memory in create_* functions
* add scope_multi abstraction
* refactor raw_call to use scope_multi
* add fixes for create_* memory cleanliness
* update optimizer tests -- callvalue is now considered constant
* move salt back into scope_multi
* add a note on reads in cache_when_complex

---------

Co-authored-by: Tanguy Rocher <tanguy.rocher@protonmail.com>

Description for the changelog

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[codecov-commenter]

Codecov Report

Merging #3610 (8450c37) into master (1711569) will decrease coverage by 0.08%.
Report is 1 commits behind head on master.
The diff coverage is 72.58%.

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@@            Coverage Diff             @@
##           master    #3610      +/-   ##
==========================================
- Coverage   89.12%   89.04%   -0.08%     
==========================================
  Files          86       86              
  Lines       11407    11450      +43     
  Branches     2595     2607      +12     
==========================================
+ Hits        10166    10196      +30     
- Misses        819      832      +13     
  Partials      422      422              

Files Changed	Coverage Δ
vyper/codegen/ir_node.py	88.08% <57.50%> (-4.05%)	⬇️
vyper/builtins/functions.py	90.55% <100.00%> (+0.02%)	⬆️

... and 1 file with indirect coverage changes

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[trocher]

LGTM