Introduce `AddressSpaceView` template parameter to `SizeClassAllocator64`.

Summary:
This is a follow up patch to r349138.

This patch makes a `AddressSpaceView` a type declaration in the
allocator parameters used by `SizeClassAllocator64`. For ASan, LSan, and
the unit tests the AP64 declarations have been made templated so that
`AddressSpaceView` can be changed at compile time. For the other
sanitizers we just hard-code `LocalAddressSpaceView` because we have no
plans to use these allocators in an out-of-process manner.

rdar://problem/45284065

Reviewers: kcc, dvyukov, vitalybuka, cryptoad, eugenis, kubamracek, george.karpenkov

Subscribers: #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D55764

llvm-svn: 349954