[analyzer] Checker for uninitialized C++ objects

This checker analyzes C++ constructor calls, and reports uninitialized fields.

Due to the nature of this problem (uninitialized fields after an object
construction), this checker doesn't search for bugs, but rather is a tool to
enforce a specific programming model where every field needs to be initialized.

This checker lands in alpha for now, and a number of followup patches will be
made to reduce false negatives and to make it easier for the user to understand
what rules the checker relies on, eg. whether a derived class' constructor is
responsible for initializing inherited data members or whether it should be
handled in the base class' constructor.

Differential Revision: https://reviews.llvm.org/D45532

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