PPC: Load from PropertyCells using PropertyCell::kValueOffset rather than Cell::kValueOffset
PPC: Load from PropertyCells using PropertyCell::kValueOffset rather than Cell::kValueOffset

Port dda2bd6f4f952c604ab836f04052684722480849

Original commit message:

R=mbrandy@us.ibm.com, svenpanne@chromium.org, danno@chromium.org, jkummerow@chromium.org

BUG=

Review URL: https://codereview.chromium.org/1028323002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27387}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh