MIPS: Fix hydrogen tracing on x64 and ARM

Port r14122 (43525afd)

BUG=

Review URL: https://codereview.chromium.org/13556003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14129 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS: Fix ARM build

Port r14123 (ded70e2a)

BUG=

Review URL: https://codereview.chromium.org/13551004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14130 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS: Ensure UseRegisterAtStart not used with fixed temp/return register

Port r14124 (f116e8b9)

BUG=

Review URL: https://codereview.chromium.org/13557002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14131 ce2b1a6d-e550-0410-aec6-3dcde31c8c00