[msan] MemorySanitizer runtime.

Initial commit of the MemorySanitizer runtime library.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@169858 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index b7cd07e..e771904 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -9,8 +9,9 @@
   add_subdirectory(ubsan)
 endif()
 if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
-  # ThreadSanitizer is supported on Linux only.
+  # ThreadSanitizer and MemorySanitizer are supported on Linux only.
   add_subdirectory(tsan)
+  add_subdirectory(msan)
 endif()
 
 # FIXME: Add support for the profile library.