Port fd596007

Original Commit Message:

    Use an opaque format for the frame type marker on the stack, where the
    marker is simply shifted left by 1 instead of being a Smi. This allows
    us to generate simpler code for frame initialisation, as we can push a
    smaller value, decreasing the prologue by 4 bytes and one instruction.

R=leszeks@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2709483007
Cr-Commit-Position: refs/heads/master@{#43356}