LinkageChecker.create and LinkageChecker.findSymbolProblems should not be two separate public methods

// TODO LinkageChecker.create and LinkageChecker.findSymbolProblems
// should not be two separate public methods since we all call
// findSymbolProblems immediately after create

Start by inspecting LinkageChecker.create and LinkageChecker.findSymbolProblems, then search for their call sites to understand how the methods are used together. The refactor is done when the redundant public-method separation is resolved without leaving callers dependent on two consecutive operations, but the issue does not specify the intended replacement API.

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