[lsan] Put SANITIZER_INTERFACE_ATTRIBUTE on LSan interface functions.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@183429 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/lsan/lsan_common.cc b/lib/lsan/lsan_common.cc
index a42469b..b78bbc3 100644
--- a/lib/lsan/lsan_common.cc
+++ b/lib/lsan/lsan_common.cc
@@ -404,6 +404,7 @@
 using namespace __lsan;  // NOLINT
 
 extern "C" {
+SANITIZER_INTERFACE_ATTRIBUTE
 void __lsan_ignore_object(const void *p) {
   // Cannot use PointsIntoChunk or LsanMetadata here, since the allocator is not
   // locked.