Rather than explicitly requesting MAP_HUGETLB mappings, which requires
kernel configuration, we should rely on the "Transparent Hugepages"
feature, where eligible allocation requests are automatically fulfilled
with huge page mappings.

Bug: chromium:1041232
Change-Id: I5263da7a23290316aa7b99e63881ca88e65b4e34
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1997442
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65741}