Merge bleeding edge up to 8774 into the GC branch.

src/platform.h

Index: src/platform.h
===================================================================
--- src/platform.h	(revision 8778)
+++ src/platform.h	(working copy)
@@ -177,6 +177,9 @@
   static FILE* FOpen(const char* path, const char* mode);
   static bool Remove(const char* path);
 
+  // Opens a temporary file, the file is auto removed on close.
+  static FILE* OpenTemporaryFile();
+
   // Log file open mode is platform-dependent due to line ends issues.
   static const char* const LogFileOpenMode;
 
@@ -203,15 +206,13 @@
                         size_t* allocated,
                         bool is_executable);
   static void Free(void* address, const size_t size);
+
+  // Assign memory as a guard page so that access will cause an exception.
+  static void Guard(void* address, const size_t size);
+
   // Get the Alignment guaranteed by Allocate().
   static size_t AllocateAlignment();
 
-#ifdef ENABLE_HEAP_PROTECTION
-  // Protect/unprotect a block of memory by marking it read-only/writable.
-  static void Protect(void* address, size_t size);
-  static void Unprotect(void* address, size_t size, bool is_executable);
-#endif
-
   // Returns an indication of whether a pointer is in a space that
   // has been allocated by Allocate().  This method may conservatively
   // always return false, but giving more accurate information may
@@ -612,7 +613,6 @@
   bool has_external_callback : 1;
 };
 
-#ifdef ENABLE_LOGGING_AND_PROFILING
 class Sampler {
  public:
   // Initialize sampler.
@@ -671,8 +671,6 @@
 };
 
 
-#endif  // ENABLE_LOGGING_AND_PROFILING
-
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_