Revert "Introduce MoveDouble to the X64 MacroAssembler" (r17383)

The direction is to use "movl, movq, movp" instead of introducing new
Macro assembler instructions.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/101083002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19210 ce2b1a6d-e550-0410-aec6-3dcde31c8c00