Fix register clobbering in LoadIC for interceptors.

Fix register clobbering in LoadIC for interceptors.

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

Committed: https://code.google.com/p/v8/source/detail?r=11492

[Vyacheslav Egorov (Chromium), 2012-05-03 11:05:45]

lgtm