X87:  We should never allocate a 0-sized buffer, so never grow from 0.

port r22947

original commit message:

   We should never allocate a 0-sized buffer, so never grow from 0.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/444403002

Patch from Chunyang Dai <chunyang.dai@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22958 ce2b1a6d-e550-0410-aec6-3dcde31c8c00