* src/x64/lithium-codegen-x64.cc (DoLoadKeyedFastDoubleElement)
  (DoStoreKeyedFastDoubleElement): Remove set but unused variables.

BUG=
TEST=Fixes a build with gcc-4.6.

Review URL: http://codereview.chromium.org/7491041
Patch from Andy Wingo <wingo@igalia.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8738 ce2b1a6d-e550-0410-aec6-3dcde31c8c00