[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
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@364866
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projects / clang / commit