VM: Tell lsan about mmap()ed regions used for our heap

runtime/platform/address_sanitizer.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_PLATFORM_ADDRESS_SANITIZER_H_
 #define RUNTIME_PLATFORM_ADDRESS_SANITIZER_H_
 
 #include "platform/globals.h"
 
 // Allow the use of ASan (AddressSanitizer). This is needed as ASan needs to be
 // told about areas where the VM does the equivalent of a long-jump.
 #if defined(__has_feature)
+
 #if __has_feature(address_sanitizer)
 extern "C" void __asan_unpoison_memory_region(void*, size_t);
+extern "C" void __lsan_register_root_region(const void* p, size_t size);
+extern "C" void __lsan_unregister_root_region(const void* p, size_t size);
 #define ASAN_UNPOISON(ptr, len) __asan_unpoison_memory_region(ptr, len)
+#define LSAN_REGISTER_ROOT_REGION(ptr, len)                                    \
+  __lsan_register_root_region(ptr, len)
+#define LSAN_UNREGISTER_ROOT_REGION(ptr, len)                                  \
+  __lsan_unregister_root_region(ptr, len)
 #else  // __has_feature(address_sanitizer)
 #define ASAN_UNPOISON(ptr, len)                                                \
   do {                                                                         \
   } while (false && (ptr) == 0 && (len) == 0)
+#define LSAN_REGISTER_ROOT_REGION(ptr, len)                                    \
+  do {                                                                         \
+  } while (false && (ptr) == 0 && (len) == 0)
+#define LSAN_UNREGISTER_ROOT_REGION(ptr, len)                                  \
+  do {                                                                         \
+  } while (false && (ptr) == 0 && (len) == 0)
 #endif  // __has_feature(address_sanitizer)
+
 #else   // defined(__has_feature)
+
 #define ASAN_UNPOISON(ptr, len)                                                \
   do {                                                                         \
   } while (false && (ptr) == 0 && (len) == 0)
+#define LSAN_REGISTER_ROOT_REGION(ptr, len)                                    \
+  do {                                                                         \
+  } while (false && (ptr) == 0 && (len) == 0)
+#define LSAN_UNREGISTER_ROOT_REGION(ptr, len)                                  \
+  do {                                                                         \
+  } while (false && (ptr) == 0 && (len) == 0)
+
 #endif  // defined(__has_feature)
 
 #endif  // RUNTIME_PLATFORM_ADDRESS_SANITIZER_H_