X87: Encapsulate megamorphic load/tail-call in hydrogen
port r23772.
original commit message:
To aid vector-based load ic work, we need to be able to handle
the megamorphic load case in hydrogen. A simple approach is to
wrap the probe activity in a hydrogen instruction.
The instruction is novel in that it always tail-calls away.
BUG=
R=weiliang.lin@intel.com
Review URL: https://codereview.chromium.org/
564683002
Patch from Jing Bao <jing.bao@intel.com>.
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23889
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00