[v8/f20] (3 commits) ...backports for nodejs 0.10.36

[T.C. Hollingsworth]

Summary of changes:

  284f7bc... use system valgrind header (1141483) (*)
  b54ed07... rebuild for ICU 54.1 (*)
  e475573... backports for nodejs 0.10.36 (*)

(*) This commit already existed in another branch; no separate mail sent