Update Backtrace::Create to use new define.

Change-Id: Ib345ef796c99d12fb3a4118f28edec7cbffa76d2
diff --git a/runtime/utils.cc b/runtime/utils.cc
index e039581..2339903 100644
--- a/runtime/utils.cc
+++ b/runtime/utils.cc
@@ -1043,7 +1043,7 @@
 }
 
 void DumpNativeStack(std::ostream& os, pid_t tid, const char* prefix, bool include_count) {
-  UniquePtr<Backtrace> backtrace(Backtrace::Create(-1, tid));
+  UniquePtr<Backtrace> backtrace(Backtrace::Create(BACKTRACE_CURRENT_PROCESS, tid));
   if (!backtrace->Unwind(0)) {
     os << prefix << "(backtrace::Unwind failed for thread " << tid << ")\n";
     return;