Add more details the --trace-deopt output

src/x64/deoptimizer-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 346 matching lines @@
   int limit = input_offset - (parameter_count * kPointerSize);
   while (ok && input_offset > limit) {
     ok = DoOsrTranslateCommand(&iterator, &input_offset);
   }
 
   // There are no translation commands for the caller's pc and fp, the
   // context, and the function.  Set them up explicitly.
   for (int i = 0; ok && i < 4; i++) {
     intptr_t input_value = input_->GetFrameSlot(input_offset);
     if (FLAG_trace_osr) {
-      PrintF("    [esp + %d] <- 0x%08" V8PRIxPTR " ; [esp + %d] (fixed part)\n",
+      const char* name = "UNKNOWN";
+      switch (i) {
+        case 0: name = "caller's pc"; break;
+        case 1: name = "rbp"; break;
+        case 2: name = "context"; break;
+        case 3: name = "function"; break;
+      }
+      PrintF("    [rsp + %d] <- 0x%08" V8PRIxPTR " ; [rsp + %d] "
+             "(fixed part - %s)\n",
              output_offset,
              input_value,
-             input_offset);
+             input_offset,
+             name);
     }
     output_[0]->SetFrameSlot(output_offset, input_->GetFrameSlot(input_offset));
     input_offset -= kPointerSize;
     output_offset -= kPointerSize;
   }
 
   // Translate the rest of the frame.
   while (ok && input_offset >= 0) {
     ok = DoOsrTranslateCommand(&iterator, &input_offset);
   }
@@ skipping 403 matching lines @@
   }
   __ bind(&done);
 }
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64