tree df50ac52ddc26e2ba73a35457317846f854074e6
parent 590e3405eade260738ad30d240b6c6e2b373d9ef
author Eric Fiselier <eric@efcs.ca> 1564701078 +0000
committer Eric Fiselier <eric@efcs.ca> 1564701078 +0000

Refactor deque to centralize handling of spare blocks.

I have upcoming changes that modify how deque handles spare blocks.
This cleanup is intended to make those changes easier to review
and understand. This patch should have NFC.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@367631 91177308-0d34-0410-b5e6-96231b3b80d8