[analyzer] List checkers in 3 categories: released, alpha, developer
Previously, the only way to display the list of available checkers was
to invoke the analyzer with -analyzer-checker-help frontend flag. This
however wasn't really great from a maintainer standpoint: users came
across checkers meant strictly for development purposes that weren't to
be tinkered with, or those that were still in development. This patch
creates a clearer division in between these categories.
From now on, we'll have 3 flags to display the list checkers. These
lists are mutually exclusive and can be used in any combination (for
example to display both stable and alpha checkers).
-analyzer-checker-help: Displays the list for stable, production ready
-analyzer-checker-help-alpha: Displays the list for in development
checkers. Enabling is discouraged for non-development purposes.
-analyzer-checker-help-developer: Modeling and debug checkers. Modeling
checkers shouldn't be enabled/disabled by hand, and debug checkers shouldn't be touched by users.
Differential Revision: https://reviews.llvm.org/D62093