The OS page size for PPC linux is 64KB. The page size for
paged spaces on PPC linux is set to 4MB. kCodeRangeAreaAlignment
is set to OS page size(64KB) and kMinimumCodeRangeSize is set to the
size of 3 pages (12MB). This issue was exposed with testcase
test-spaces/Regress3540 which used kMinimumCodeRangeSize.

R=jochen@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2187833002
Cr-Commit-Position: refs/heads/master@{#38180}