Remember narrowed types from the constructor from deep PropertyFetches #4315
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types which get narrowed in __construct() on
readonlyproperties can be useful when analyzing other methods.improve support initially added with #3930 by allowing property-fetch-chains, when all involved properties are readonly.
preparational work for #4313 (comment)
commit1 extracts 1:1 a new method
commit2+3 adds support for property-fetch chains
commit4 re-use the new method for shouldInvalidateExpression()