False positive used-before-assignmnet for assignment expressions in class initialisers

[DanielNoord]

Bug description

Same with classes and dataclasses:

class Dummy:
    def __init__(self, value):
        self.value = value

dummy = Dummy(value=val if (val := 'something') else 'anything')
print(dummy.value)

raises used-before-assigment, while

class Dummy:
    def __init__(self, value):
        self.value = value

value = val if (val := 'something') else 'anything'
dummy = Dummy(value)
print(dummy.value)

doesn't. Excepting behaviour - no errors.

Originally posted by @egormm in #3688 (comment)

Configuration

No response

Command used

pylint

Pylint output

`used-before-assignment` warning in the first example

Expected behavior

No used-before-assignment errors for the first example.

Pylint version

pylint 2.11.2-dev0
astroid 2.8.4
Python 3.9.6 (default, Aug  2 2021, 08:23:35) 
[Clang 12.0.5 (clang-1205.0.22.11)]

OS / Environment

No response

Additional dependencies

No response