Type users of AllocateFixedArray with intptr parameters.

Bug: v8:7796
Change-Id: I4b155fb3fcb90fe66a3c20a24f0cea678a5d85bc
Reviewed-on: https://chromium-review.googlesource.com/1078347
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53436}