Update for libunwindstack changes.

Test: Builds.
Change-Id: I4a8f2ccb15998f45822e8380c41f4e7f6fac07d2
diff --git a/runtime/backtrace_helper.cc b/runtime/backtrace_helper.cc
index 2d39270..d0f4b34 100644
--- a/runtime/backtrace_helper.cc
+++ b/runtime/backtrace_helper.cc
@@ -52,8 +52,9 @@
         dex_(memory_),
         unwinder_(max_depth, &maps_, memory_) {
     CHECK(maps_.Parse());
-    unwinder_.SetJitDebug(&jit_, unwindstack::Regs::CurrentArch());
-    unwinder_.SetDexFiles(&dex_, unwindstack::Regs::CurrentArch());
+    unwinder_.SetArch(unwindstack::Regs::CurrentArch());
+    unwinder_.SetJitDebug(&jit_);
+    unwinder_.SetDexFiles(&dex_);
     unwinder_.SetResolveNames(false);
     unwindstack::Elf::SetCachingEnabled(true);
   }