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[analyzer] Support C++17 aggregates with bases without constructors.

Description

[analyzer] Support C++17 aggregates with bases without constructors.

RegionStore now knows how to bind a nonloc::CompoundVal that represents the
value of an aggregate initializer when it has its initial segment of sub-values
correspond to base classes.

Additionally, fixes the crash from pr40022.

Differential Revision: https://reviews.llvm.org/D59054