manifest: use fulltextcache instead of _fulltextcache fulltextcache is part of the documented interface and is aliased to _fulltextcache. Differential Revision: https://phab.mercurial-scm.org/D4394

manifest: rename manifestlog._revlog to _rootstore Because it may not be a revlog. Differential Revision: https://phab.mercurial-scm.org/D4393

manifest: use public API for obtaining storage object We should not be accessing private attributes on the manifestlog, since its behavior is governed by an interface. Differential Revision: https://phab.mercurial-scm.org/D4392

perf: add function for obtaining manifest revision This will use the modern API if available or fall back to the legacy direct revlog access case. Without this, the perf command won't work on all code bases. Differential Revision: https://phab.mercurial-scm.org/D4391

perf: use storage API for resolving manifest node lookup() isn't part of the storage API. And this code shouldn't be accessing manifestlog._revlog directly for the modern code base. So let's port it to the modern API. Note that the previous code was busted for cases where we needed to call lookup() because lookup() isn't exposed by manifestrevlog any more. This change is strictly BC breaking because we no longer support resolving partial nodes. But it is a perf* command and I don't think we should flag the change as such. Differential Revision: https://phab.mercurial-scm.org/D4390

manifest: change terminology for storage in context classes Storage may not be backed by revlogs. So it is wrong to refer to storage as "revlog" or use abbreviations like "rl." This commit replaces revlog terminology in manifest context classes and starts referring to things as "store" or "storage." Differential Revision: https://phab.mercurial-scm.org/D4389

manifest: don't go through revlog to access node symbols The revlog module re-exports some node.* symbols courtesy of importing them. Let's access the node.* symbols via our local import. Differential Revision: https://phab.mercurial-scm.org/D4388