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[analyzer] Add analyzer option to limit the number of imported TUs

Description

[analyzer] Add analyzer option to limit the number of imported TUs

Summary:
During CTU analysis of complex projects, the loaded AST-contents of
imported TUs can grow bigger than available system memory. This option
introduces a threshold on the number of TUs to be imported for a single
TU in order to prevent such cases.

Differential Revision: https://reviews.llvm.org/D59798

Details