[lsan] Fix r182256.

Add missing call to GetUserBegin().

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182267 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/lsan/lsan_common_linux.cc b/lib/lsan/lsan_common_linux.cc
index a354aee..b09e2f9 100644
--- a/lib/lsan/lsan_common_linux.cc
+++ b/lib/lsan/lsan_common_linux.cc
@@ -101,6 +101,7 @@
 }
 
 void ProcessPlatformSpecificAllocationsCb::operator()(void *p) const {
+  p = GetUserBegin(p);
   LsanMetadata m(p);
   if (m.allocated() && m.tag() != kReachable) {
     if (linker->containsAddress(GetCallerPC(m.stack_trace_id()))) {