Print reason for disabling optimization. Kill --trace-bailout flag.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 82cefdcbba3054045a2b3fb227fa360a26b8ccd5..b63ceacc3decf6ba0d7ca4518d56e8c2b1df60b2 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -7831,7 +7831,7 @@ void SharedFunctionInfo::EnableDeoptimizationSupport(Code* recompiled) {
 }
 
 
-void SharedFunctionInfo::DisableOptimization() {
+void SharedFunctionInfo::DisableOptimization(const char* reason) {
   // Disable optimization for the shared function info and mark the
   // code as non-optimizable. The marker on the shared function info
   // is there because we flush non-optimized code thereby loosing the
@@ -7847,7 +7847,8 @@ void SharedFunctionInfo::DisableOptimization() {
     code()->set_optimizable(false);
   }
   if (FLAG_trace_opt) {
-    PrintF("[disabled optimization for %s]\n", *DebugName()->ToCString());
+    PrintF("[disabled optimization for %s, reason: %s]\n",
+           *DebugName()->ToCString(), reason);
   }
 }