make gc branch compile on Win32.

src/platform-win32.cc

Index: src/platform-win32.cc
diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index 8673f047ee2a7bac6786a8463322d03d0fab9cce..33844916ed4356a1a1772d2e6c0c2489771948f7 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -1434,7 +1434,7 @@ bool VirtualMemory::IsReserved() {
 
 
 VirtualMemory::VirtualMemory(size_t size) {
-  address_ = VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
+  address_ = ReserveRegion(size);
   size_ = size;
 }
 
@@ -1447,22 +1447,47 @@ VirtualMemory::~VirtualMemory() {
 
 
 bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) {
+  if (CommitRegion(address, size, is_executable)) {
+    UpdateAllocatedSpaceLimits(address, static_cast<int>(size));
+    return true;
+  }
+  return false;
+}
+
+
+bool VirtualMemory::Uncommit(void* address, size_t size) {
+  ASSERT(IsReserved());
+  return UncommitRegion(address, size);
+}
+
+
+void* VirtualMemory::ReserveRegion(size_t size) {
+  return VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
+}
+
+
+bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
   int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
-  if (NULL == VirtualAlloc(address, size, MEM_COMMIT, prot)) {
+  if (NULL == VirtualAlloc(base, size, MEM_COMMIT, prot)) {
     return false;
   }
 
-  UpdateAllocatedSpaceLimits(address, static_cast<int>(size));
+  UpdateAllocatedSpaceLimits(base, static_cast<int>(size));
   return true;
 }
 
 
-bool VirtualMemory::Uncommit(void* address, size_t size) {
-  ASSERT(IsReserved());
-  return VirtualFree(address, size, MEM_DECOMMIT) != false;
+bool VirtualMemory::UncommitRegion(void* base, size_t size) {
+  return VirtualFree(base, size, MEM_DECOMMIT) != false;
 }
 
 
+bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
+  return VirtualFree(base, size, MEM_DECOMMIT) != false;
+}
+
+
+
 // ----------------------------------------------------------------------------
 // Win32 thread support.