Merge bleeding edge up to 8774 into the GC branch.

src/v8globals.h

 // 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 387 matching lines @@
 
 
 // AccessorCallback
 struct AccessorDescriptor {
   MaybeObject* (*getter)(Object* object, void* data);
   MaybeObject* (*setter)(JSObject* object, Object* value, void* data);
   void* data;
 };
 
 
-// Logging and profiling.
-// A StateTag represents a possible state of the VM.  When compiled with
-// ENABLE_VMSTATE_TRACKING, the logger maintains a stack of these.
-// Creating a VMState object enters a state by pushing on the stack, and
-// destroying a VMState object leaves a state by popping the current state
-// from the stack.
+// Logging and profiling.  A StateTag represents a possible state of
+// the VM. The logger maintains a stack of these. Creating a VMState
+// object enters a state by pushing on the stack, and destroying a
+// VMState object leaves a state by popping the current state from the
+// stack.
 
 #define STATE_TAG_LIST(V) \
   V(JS)                   \
   V(GC)                   \
   V(COMPILER)             \
   V(OTHER)                \
   V(EXTERNAL)
 
 enum StateTag {
 #define DEF_STATE_TAG(name) name,
@@ skipping 86 matching lines @@
 };
 
 
 // Used to specify whether a receiver is implicitly or explicitly
 // provided to a call.
 enum CallKind {
   CALL_AS_METHOD = 0,
   CALL_AS_FUNCTION
 };
 
+
+static const uint32_t kHoleNanUpper32 = 0x7FFFFFFF;
+static const uint32_t kHoleNanLower32 = 0xFFFFFFFF;
+static const uint32_t kNaNOrInfinityLowerBoundUpper32 = 0x7FF00000;
+
+const uint64_t kHoleNanInt64 =
+    (static_cast<uint64_t>(kHoleNanUpper32) << 32) | kHoleNanLower32;
+const uint64_t kLastNonNaNInt64 =
+    (static_cast<uint64_t>(kNaNOrInfinityLowerBoundUpper32) << 32);
+
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_