Add missing cpu.h includes to mips/x87

BUG=none
TBR=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/358073005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22101 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix perfjit printf format for filename

TBR=jarin@chromium.org
LOG=n
BUG=none

Review URL: https://codereview.chromium.org/357333002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22102 ce2b1a6d-e550-0410-aec6-3dcde31c8c00