Improve execution time of cctest/test-types.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/239513009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20798 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/test-types.cc

@@ -139,7 +139,7 @@ class Types {
       types.push_back(Type::Constant(*it, region));
     }
 
-    for (int i = 0; i < 100; ++i) {
+    for (int i = 0; i < 50; ++i) {
       types.push_back(Fuzz());
     }
   }