- Add typed IsHeapNumberPositive, IsNumberNonNegativeSafeInteger, IsInteger,
  IsSafeInteger and IsHeapNumberUint32 helpers on CodeStubAssembler
- Type NumberIsInteger and NumberIsSafeInteger builtin

Bug: chromium:847204, v8:6949
Change-Id: I27d3ab79bd17312c223209ed0b221c174024126e
Reviewed-on: https://chromium-review.googlesource.com/1087961
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53707}