Expose transferable constructor to Int8List

runtime/vm/os_win.cc

Index: runtime/vm/os_win.cc
diff --git a/runtime/vm/os_win.cc b/runtime/vm/os_win.cc
index 6f3f4c436f05ff3fedd00cad9e270e1857481ccf..72604dc42eef0284b216d2c5b2a67f5b9484a90a 100644
--- a/runtime/vm/os_win.cc
+++ b/runtime/vm/os_win.cc
@@ -4,6 +4,7 @@
 
 #include "vm/os.h"
 
+#include <malloc.h>
 #include <time.h>
 
 #include "platform/assert.h"
@@ -102,6 +103,23 @@ int64_t OS::GetCurrentTimeMicros() {
 }
 
 
+void* OS::AlignedAllocate(intptr_t size, intptr_t alignment) {
+  const int kMinimumAlignment = 16;
+  ASSERT(Utils::IsPowerOfTwo(alignment));
+  ASSERT(alignment >= kMinimumAlignment);
+  void* p = _aligned_malloc(size, alignment);
+  if (p == NULL) {
+    UNREACHABLE();
+  }
+  return p;
+}
+
+
+void OS::AlignedFree(void* ptr) {
+  _aligned_free(ptr);
+}
+
+
 word OS::ActivationFrameAlignment() {
 #ifdef _WIN64
   // Windows 64-bit ABI requires the stack to be 16-byte aligned.