Experiments on calculating reciprocal of square root

BUG=
R=reed@google.com, rmistry@chromium.org, bsalomon@google.com, tomhudson@chromium.org, tomhudson@google.com

Author: yang.gu@intel.com

Review URL: https://chromiumcodereview.appspot.com/21755002

git-svn-id: http://skia.googlecode.com/svn/trunk/include@10671 2bbb7eff-a529-9590-31e7-b0007b416f81
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