MFC r213406:

MFC r213406:

Fix two subtle problems in PPC32 RTLD. The first is a concurrency issue
where long PLT calls in multi-threaded environments could end up with
incorrect jmptab values. The second is that, after the addition of extended
PLT support, I forgot to update the PLT icache synchronization code to cover
the extended PLT instead of just the basic PLT.

git-svn-id: svn://svn.freebsd.org/base/stable/8@213833 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f