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[analyzer] NFC: Add a convenient CallDescriptionMap class.

Description

[analyzer] NFC: Add a convenient CallDescriptionMap class.

It encapsulates the procedure of figuring out whether a call event
corresponds to a function that's modeled by a checker.

Checker developers no longer need to worry about performance of
lookups into their own custom maps.

Add unittests - which finally test CallDescription itself as well.

Differential Revision: https://reviews.llvm.org/D62441