Revert r148981 because it fails test/Driver/freebsd.c

Original log:

Author: chandlerc <chandlerc@91177308-0d34-0410-b5e6-96231b3b80d8>
Date:   Wed Jan 25 21:32:31 2012 +0000

    Try to unbreak the FreeBSD toolchain's detection of 32-bit targets
    inside a 64-bit freebsd machine with the 32-bit compatibility layer
    installed. The FreeBSD image always has the /usr/lib32 directory, so
    test for the more concrete existence of crt1.o. Also enhance the tests
    for freebsd to clarify what these trees look like and exercise the new
    code.

    Thanks to all the FreeBSD folks for helping me understand what caused
    the failure and how we might fix it. =] That helps a lot. Also, yay
    build bots.

llvm-svn: 148993