Fix compiler warnings on Win64.

test/cctest/test-types.cc

Index: test/cctest/test-types.cc
diff --git a/test/cctest/test-types.cc b/test/cctest/test-types.cc
index 6cdd46c8665d042881a00feb014885826a2803ea..4c1ed3c8f9837663e24dfafd6b3313fa4e425db7 100644
--- a/test/cctest/test-types.cc
+++ b/test/cctest/test-types.cc
@@ -73,8 +73,8 @@ class Types {
     }
 
     while (types.size() < kMaxTypes) {
-      size_t i = rng.NextInt(types.size());
-      size_t j = rng.NextInt(types.size());
+      size_t i = rng.NextInt(static_cast<int>(types.size()));
+      size_t j = rng.NextInt(static_cast<int>(types.size()));
       if (i != j) types.push_back(Type::Union(types[i], types[j], region));
     }
   }