Fix some register names in the ia32 disassembler.  Byte register and XMM register names were sometimes not used, or used where they shouldn't be.
Review URL: http://codereview.chromium.org/6702001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7205 ce2b1a6d-e550-0410-aec6-3dcde31c8c00