This fixes a corner-case where the receiver register was clobbered by
LoadICs for interceptors and inlined followup code still relied on the
receiver to be intact in case of prototype changes.

R=vegorov@chromium.org
BUG=chromium:125988
TEST=cctest/test-api/Regress125988

Review URL: https://chromiumcodereview.appspot.com/10358010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11492 ce2b1a6d-e550-0410-aec6-3dcde31c8c00