ARM: Optimize shifts by constant integers, especially
shifts by zero or arithmetic shifts. Updated to also eliminate ASR followed by LSL as per part two of http://codereview.chromium.org/1987008/show Review URL: http://codereview.chromium.org/2054007 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4641 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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