Improve trace_opt output to help find compilation problems

src/mips/deoptimizer-mips.cc

Index: src/mips/deoptimizer-mips.cc
diff --git a/src/mips/deoptimizer-mips.cc b/src/mips/deoptimizer-mips.cc
index ecf408732834a297deb40f38e9bfc4232b4e8a43..7cc54445afc6ae0366e7916fba1dcb333ea6acb9 100644
--- a/src/mips/deoptimizer-mips.cc
+++ b/src/mips/deoptimizer-mips.cc
@@ -53,7 +53,7 @@ void Deoptimizer::DeoptimizeFunctionWithPreparedFunctionList(
 
   // The optimized code is going to be patched, so we cannot use it
   // any more.  Play safe and reset the whole cache.
-  function->shared()->ClearOptimizedCodeMap();
+  function->shared()->ClearOptimizedCodeMap("deoptimized function");
 
   // Get the optimized code.
   Code* code = function->code();