[CS] Connect isolated conjunctions to referenced VarDecls #63456
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Currently we only consider ParamDecls, but isolated conjunctions can reference external VarDecls too.
This fixes a spurious "cannot reference invalid declaration" error when the result builder transform is disabled in the test case
rdar104687668.swift
. It also fixes the attached test case, where an if expression references a pattern var in a for loop.rdar://105080067