[turbofan] Strip useless sign-extension for store8/store16.
TEST=unittests R=svenpanne@chromium.org Review URL: https://codereview.chromium.org/698963002 Cr-Commit-Position: refs/heads/master@{#25091} git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25091 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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