This patch is in support of adding a variant of Static{Auto,Ref}Ptr for use as
static locals, taking advantage of C++11 "magic statics" such that we can lazily
initialize those variables in a thread-safe way.
In support of those classes, this patch adds two new attributes:
* `moz_static_local_class` to ensure that any instantiations of that class only
occur as static local variables;
* `moz_trivial_dtor` to ensure that these classes do not implicitly call `atexit`
and add a whole bunch of shutdown crap.
`moz_static_local_class` works similarly to `moz_global_class`, except that its
object must only instantiate as static locals.
`TrivialDtorChecker` is based on `TrivialCtorDtorChecker`, with the ctor-specific
bits removed.
Differential Revision: https://phabricator.services.mozilla.com/D39717
--HG--
rename : build/clang-plugin/TrivialCtorDtorChecker.cpp => build/clang-plugin/TrivialDtorChecker.cpp
rename : build/clang-plugin/TrivialCtorDtorChecker.h => build/clang-plugin/TrivialDtorChecker.h
extra : moz-landing-system : lando
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