X87: CallDescriptors::InitializeForIsolate() is no longer needed.

port r23652.

original commit message:

  CallDescriptors::InitializeForIsolate() is no longer needed.

  CallInterfaceDescriptors initialize themselves lazily. Soon we can also tear
  down the CodeStubInterfaceDescriptor explicit initialization step.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/541353002

Patch from Jing Bao <jing.bao@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23713 ce2b1a6d-e550-0410-aec6-3dcde31c8c00