Revert "Check for data races when reading JIT/DEX entries."

This reverts commit 85b5fecec920208ec43b42488f08d4c2e5aaeda2.

Reason for revert: Breaks ART tests, reverting to investigate.
Exempt-From-Owner-Approval: Revert.

(cherry picked from commit b9cc4fbb268652744c812415cb2e5d1fbe04879a)

Bug: 130406806
Change-Id: I634e37060b97484d627fc544e3b406fd90aaa784
diff --git a/libbacktrace/UnwindStackMap.cpp b/libbacktrace/UnwindStackMap.cpp
index 726fdfa..4518891 100644
--- a/libbacktrace/UnwindStackMap.cpp
+++ b/libbacktrace/UnwindStackMap.cpp
@@ -43,6 +43,13 @@
   // Create the process memory object.
   process_memory_ = unwindstack::Memory::CreateProcessMemory(pid_);
 
+  // Create a JitDebug object for getting jit unwind information.
+  std::vector<std::string> search_libs_{"libart.so", "libartd.so"};
+  jit_debug_.reset(new unwindstack::JitDebug(process_memory_, search_libs_));
+#if !defined(NO_LIBDEXFILE_SUPPORT)
+  dex_files_.reset(new unwindstack::DexFiles(process_memory_, search_libs_));
+#endif
+
   if (!stack_maps_->Parse()) {
     return false;
   }