[PATCH] Clean up non-conforming names

[Thomas Rodgers]

Jonathan Wakely writes:

> On 31/05/19 17:15 -0700, Thomas Rodgers wrote:
>>
>>Revising previous version of this patch to pick another missed
>>uglification.
>
> OK for trunk, thanks.
>
> I also see this one:
>
> include/pstl/parallel_backend_tbb.h:    __buffer(std::size_t n) : _M_allocator(), _M_ptr(_M_allocator.allocate(n)), _M_buf_size(n) {}

Ok, I'll clean that one up and commit along with these changes.