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* Fixes #26128 - signature comp for jsdoc @class. Another issue caused by js functions tagged with jsdoc `@constructor` not having construct signatures. A jsdoc function type that constructs a type (`function(new: Ex)`), has a construct signature and return value inferred as the constructed type where as a jsdoc `@constructor` has no construct signatures, and it's call signature has a void return type (or undefined). i.e: ```javascript /** @constructor **/ function E() {}; // typeof E -> call signature: () => void /** @param {function(new: E)} d */ function c(d) {} // typeof d -> construct: () => E ``` -- This commit fixes this (in an inelegant way) by considering `@class` function signatures as construct signatures and synthesizing it's return value _only for signature comparison_. There might be a slight performance hit, since the synthesized return value is not cached; but changing the `@class` function's return type in `getReturnTypeOfSignature` causes other issues. * Update jsdoc function test to fix mistake.