Add trampoline symbols to native debug info.

The debugger needs them to unwind through the trampolines and to
understand what is happening in the call stack.

Change-Id: Ia554058c3796788adcd7336d620a7734eb366905
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index cc1a806..7a82063 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -919,7 +919,8 @@
   if (compiler_options.GetGenerateDebugInfo()) {
     const auto* method_header = reinterpret_cast<const OatQuickMethodHeader*>(code);
     const uintptr_t code_address = reinterpret_cast<uintptr_t>(method_header->GetCode());
-    debug::MethodDebugInfo info;
+    debug::MethodDebugInfo info = debug::MethodDebugInfo();
+    info.trampoline_name = nullptr;
     info.dex_file = dex_file;
     info.class_def_index = class_def_idx;
     info.dex_method_index = method_idx;