ARM64: Sign extension on MemOperand for keyed ops
SXTW extend mode is usually cheaper on loads and stores than arithmetic, so move it to the memory accesses where possible for Keyed loads and stores. BUG= R=ulan@chromium.org Review URL: https://codereview.chromium.org/268483002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21172 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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