[PATCH] D56994: Add `LsanMetadataRemoteView` class.

[Dan Liew via Phabricator via llvm-commits]

delcypher created this revision.
delcypher added reviewers: kcc, vitalybuka, dvyukov, cryptoad, eugenis, george.karpenkov, yln, kubamracek.
Herald added a subscriber: Sanitizers.

This corresponds roughly with the existing `LsanMetadata` wrapper
class but it is intended for use in an out-of-process context.

Instead of templating the `LsanMetadata` class on `AddressSpaceView`,
we sub-class `LsanMetadata` as `LsanMetadataRemoteView` so we can
re-use as much code as possible. `LsanMetadataRemoteView` also requires
storing extra more fields which I did not want `LsanMetadata` to also
require.

This patch only provides an implementation of `LsanMetadataRemoteView`
for ASan. An implementation for LSan will be provided at a later date.

This patch uses refactorings done in

- https://reviews.llvm.org/D56968
- https://reviews.llvm.org/D56993

rdar://problem/45284065


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D56994

Files:
  lib/asan/asan_allocator.cc
  lib/lsan/lsan_common.h

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