Since the page size of PPC 64 bit machines is 64K, memory smaller than 64K
    cannot be freed causing the committed memory of code space to be
    exactly 2M. Changing the test case to accomodate this.

R=mlippautz@chromium.org, ulan@chromium.org, vogelheim@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2523293002
Cr-Commit-Position: refs/heads/master@{#41292}