[scudo][standalone] Add the memory reclaiming mechanism

Summary:
This CL implements the memory reclaiming function `releaseFreeMemoryToOS`
and its associated classes. Most of this code was originally written by
Aleksey for the Primary64 in sanitizer_common, and I made some changes to
be able to implement 32-bit reclaiming as well. The code has be restructured
a bit to accomodate for freelist of batches instead of the freearray used
in the current sanitizer_common code.

Reviewers: eugenis, vitalybuka, morehouse, hctim

Reviewed By: vitalybuka

Subscribers: srhines, mgorny, delcypher, #sanitizers, llvm-commits

Tags: #llvm, #sanitizers

Differential Revision: https://reviews.llvm.org/D61214

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@359567 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/scudo/standalone/size_class_map.h b/lib/scudo/standalone/size_class_map.h
index 50320701b..b7df54cf8 100644
--- a/lib/scudo/standalone/size_class_map.h
+++ b/lib/scudo/standalone/size_class_map.h
@@ -31,8 +31,8 @@ namespace scudo {
 //
 // This class also gives a hint to a thread-caching allocator about the amount
 // of chunks that can be cached per-thread:
-//  - MaxNumCachedHint is a hint for the max number of chunks cached per class.
-//  - 2^MaxBytesCachedLog is the max number of bytes cached per class.
+// - MaxNumCachedHint is a hint for the max number of chunks cached per class.
+// - 2^MaxBytesCachedLog is the max number of bytes cached per class.
 
 template <u8 NumBits, u8 MinSizeLog, u8 MidSizeLog, u8 MaxSizeLog,
           u32 MaxNumCachedHintT, u8 MaxBytesCachedLog>