Fix four annoying warnings:
Two "set but unused", one of which is surely an artifact from
copying code around, and the other which ought to be used for
the sake of clarity.

Two are unknown "optimize" pragmas, remove them since the code
has been shipped for years on other platforms under full optimization.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1148353002
3 files changed