Revert r340884 "Add a RingBuffer class to sanitizer_common"

The test doesn't pass on Windows, where sizeof(long) == 4 also
on 64-bit, and so it isn't a multiple of sizeof(void*).

This also reverts the follow-up r340886.

> Summary: a constrained RingBuffer optimized for fast push
>
> Reviewers: eugenis
>
> Reviewed By: eugenis
>
> Subscribers: kubamracek, mgorny, delcypher, #sanitizers, llvm-commits
>
> Differential Revision: https://reviews.llvm.org/D51196

llvm-svn: 340924