Remove dependency from platform files on v8.h

src/platform-macos.cc

Index: src/platform-macos.cc
diff --git a/src/platform-macos.cc b/src/platform-macos.cc
index dfff0d17efdb1488077283cadb03d970e371088f..7b6609b63fd610be0cc4f158dc719b7c772d0a7b 100644
--- a/src/platform-macos.cc
+++ b/src/platform-macos.cc
@@ -31,11 +31,12 @@
 #include <sys/time.h>
 #include <sys/types.h>
 
-#undef MAP_TYPE
+#include <cmath>
 
-#include "src/v8.h"
+#undef MAP_TYPE
 
 #include "src/platform.h"
+#include "src/utils.h"
 
 
 namespace v8 {
@@ -194,8 +195,8 @@ VirtualMemory::VirtualMemory(size_t size, size_t alignment)
                            kMmapFdOffset);
   if (reservation == MAP_FAILED) return;
 
-  Address base = static_cast<Address>(reservation);
-  Address aligned_base = RoundUp(base, alignment);
+  uint8_t* base = static_cast<uint8_t*>(reservation);
+  uint8_t* aligned_base = RoundUp(base, alignment);
   ASSERT_LE(base, aligned_base);
 
   // Unmap extra memory reserved before and after the desired block.