Add thread-safety to creation of MemCopy and modulo functions.

test/cctest/test-utils.cc

Index: test/cctest/test-utils.cc
diff --git a/test/cctest/test-utils.cc b/test/cctest/test-utils.cc
index 018018a131d603d66f874019ee54a15790f944db..e96fcd1825f7294c9e2ba49aae5ba9903d627955 100644
--- a/test/cctest/test-utils.cc
+++ b/test/cctest/test-utils.cc
@@ -89,8 +89,8 @@ void TestMemCopy(Vector<byte> src,
   memset(dst.start(), 0xFF, dst.length());
   byte* to = dst.start() + 32 + destination_alignment;
   byte* from = src.start() + source_alignment;
-  int length = kMinComplexMemCopy + length_alignment;
-  MemCopy(to, from, static_cast<size_t>(length));
+  int length = OS::kMinComplexMemCopy + length_alignment;
+  OS::MemCopy(to, from, static_cast<size_t>(length));
   printf("[%d,%d,%d]\n",
          source_alignment, destination_alignment, length_alignment);
   for (int i = 0; i < length; i++) {
@@ -104,7 +104,7 @@ void TestMemCopy(Vector<byte> src,
 
 TEST(MemCopy) {
   OS::Setup();
-  const int N = kMinComplexMemCopy + 128;
+  const int N = OS::kMinComplexMemCopy + 128;
   Vector<byte> buffer1 = Vector<byte>::New(N);
   Vector<byte> buffer2 = Vector<byte>::New(N);