Remove dependency from platform files on v8.h

src/platform-freebsd.cc

Index: src/platform-freebsd.cc
diff --git a/src/platform-freebsd.cc b/src/platform-freebsd.cc
index d77b30f2454536c0d555c5dfcc0eab20d2a1714f..9e668a8ba647471946cbf3578e811ce74139941c 100644
--- a/src/platform-freebsd.cc
+++ b/src/platform-freebsd.cc
@@ -25,11 +25,12 @@
 #include <stdarg.h>
 #include <strings.h>    // index
 
-#undef MAP_TYPE
+#include <cmath>
 
-#include "src/v8.h"
+#undef MAP_TYPE
 
 #include "src/platform.h"
+#include "src/utils.h"
 
 
 namespace v8 {
@@ -192,8 +193,8 @@ 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.