Fix warnings on Win64.

test/cctest/test-alloc.cc

Index: test/cctest/test-alloc.cc
diff --git a/test/cctest/test-alloc.cc b/test/cctest/test-alloc.cc
index 1235b13b2db088d624241930208da124de2f9722..7921d2abe4459a39ed6e2ddd87ea7cbd9ea53e53 100644
--- a/test/cctest/test-alloc.cc
+++ b/test/cctest/test-alloc.cc
@@ -195,9 +195,9 @@ TEST(CodeRange) {
            Pseudorandom() % 5000 + 1;
       size_t allocated = 0;
       void* base = CodeRange::AllocateRawMemory(requested, &allocated);
-      blocks.Add(Block(base, allocated));
-      current_allocated += allocated;
-      total_allocated += allocated;
+      blocks.Add(Block(base, static_cast<int>(allocated)));
+      current_allocated += static_cast<int>(allocated);
+      total_allocated += static_cast<int>(allocated);
     } else {
       // Free a block.
       int index = Pseudorandom() % blocks.length();