[scudo] Simplify internal names (NFC)
Summary:
There is currently too much redundancy in the class/variable/* names in Scudo:
- we are in the namespace `__scudo`, so there is no point in having something
named `ScudoX` to end up with a final name of `__scudo::ScudoX`;
- there are a lot of types/* that have `Allocator` in the name, given that
Scudo is an allocator I figure this doubles up as well.
So change a bunch of the Scudo names to make them shorter, less redundant, and
overall simpler. They should still be pretty self explaining (or at least it
looks so to me).
The TSD part will be done in another CL (eg `__scudo::ScudoTSD`).
Reviewers: alekseyshl, eugenis
Reviewed By: alekseyshl
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D49505
llvm-svn: 337557