C++ profiles processor: align browser mode with the old implementation, sample VM state.

src/globals.h

 // Copyright 2006-2009 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 453 matching lines @@
 // from the stack.
 
 #define STATE_TAG_LIST(V) \
   V(JS)                   \
   V(GC)                   \
   V(COMPILER)             \
   V(OTHER)                \
   V(EXTERNAL)
 
 enum StateTag {
+#ifdef ENABLE_CPP_PROFILES_PROCESSOR
+  // This is to ensure that VM state field value of TickSample
+  // never gets equal to SamplingCircularQueue::kClear.
+  NULL_STATE = 0,
+#endif
 #define DEF_STATE_TAG(name) name,
   STATE_TAG_LIST(DEF_STATE_TAG)
 #undef DEF_STATE_TAG
   // Pseudo-types.
   state_tag_count
 };
 
 
 // -----------------------------------------------------------------------------
 // Macros
@@ skipping 115 matching lines @@
                   CMOV = 15,   // x86
                   RDTSC = 4,   // x86
                   CPUID = 10,  // x86
                   VFP3 = 1,    // ARM
                   ARMv7 = 2,   // ARM
                   SAHF = 0};   // x86
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBALS_H_