Port 2fc2cb99

Original commit message:
    The old code was not ready for properly initialize objects with non
    standard headers and non zero in-object properties number.

    MacroAssembler::Allocate() implementations now return both start and
    end addresses of the new object (done by parameter renaming).

R=ishell@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1472473003

Cr-Commit-Position: refs/heads/master@{#32182}