Refactor jit debugger interface and its ELF creation.

Make it possible to store more then one method per entry,
and ref-count the number of live methods per entry.

Test: m test-art-host-gtest
Change-Id: I45d69185e85e47fbee88a8d1f549ede9875a3c0a
diff --git a/compiler/debug/method_debug_info.h b/compiler/debug/method_debug_info.h
index 43c8de2..d0b03ec 100644
--- a/compiler/debug/method_debug_info.h
+++ b/compiler/debug/method_debug_info.h
@@ -27,7 +27,7 @@
 namespace debug {
 
 struct MethodDebugInfo {
-  std::string trampoline_name;
+  std::string custom_name;
   const DexFile* dex_file;  // Native methods (trampolines) do not reference dex file.
   size_t class_def_index;
   uint32_t dex_method_index;