Improve trace_opt output to help find compilation problems

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 1b4ed5b3b572e8b7cb17b85bddf6479496ef692b..e85bf16d66539601d50ad1c2b245b665d0458e04 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5806,7 +5806,7 @@ class SharedFunctionInfo: public HeapObject {
   void InstallFromOptimizedCodeMap(JSFunction* function, int index);
 
   // Clear optimized code map.
-  inline void ClearOptimizedCodeMap();
+  void ClearOptimizedCodeMap(const char* reason);
 
   // Add a new entry to the optimized code map.
   static void AddToOptimizedCodeMap(Handle<SharedFunctionInfo> shared,
@@ -6660,6 +6660,8 @@ class JSFunction: public JSObject {
   }
 #endif
 
+  bool PassesHydrogenFilter();
+
   // Layout descriptors. The last property (from kNonWeakFieldsEndOffset to
   // kSize) is weak and has special handling during garbage collection.
   static const int kCodeEntryOffset = JSObject::kHeaderSize;
@@ -7792,7 +7794,7 @@ class String: public Name {
 
   // String equality operations.
   inline bool Equals(String* other);
-  bool IsUtf8EqualTo(Vector<const char> str);
+  bool IsUtf8EqualTo(Vector<const char> str, bool allow_prefix_match = false);
   bool IsOneByteEqualTo(Vector<const uint8_t> str);
   bool IsTwoByteEqualTo(Vector<const uc16> str);