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We can't expect that the test array would be put in the same place in
memory between test runs and since [l, r) is being rounded to the page
size. Due to that we can't make any assumptions about the elements
inside of the final range and can't calculate the resulting sum, since
all elements inside of the range are zeroed.

The tests were modified the following way:
1) All zeroes in the test array were replaced by one to be able to
  locate all zeroed elements in it.
2) GetSum method was replaced by GetZeroes method which is expected to
  return 4096.
3) The size of the array was set to 2*4096 - 1 to prevent unlikely case
  of array aligning perfectly on memory and having 2 pages cut out of
  it.

Bug: 998082
Change-Id: Idde87569decd3a52ecd1a0c034ab638833d8e0b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795791
Commit-Queue: Denis Solonkov <solonkovda@google.com>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697190}