Racket hangs on ppc64 when jit is enabled.

Right here:
../../racket/racket3m  -cqu ./../../racket/gc2/xform.rkt --setup ../../racket/gc2 --cpp "gcc -E -I./../../racket/gc2 -I./../../racket/ -I./../../racket/include/ -DUSE_SENORA_GC     -Dwx_xt -MMD"  --keep-lines -o xsrc/grmain.c +D INITIAL_COLLECTS_DIRECTORY='"'"`cd ./../../../collects; pwd`"'"' +D INITIAL_CONFIG_DIRECTORY='"'"`cd ./../../..; pwd`/etc"'"' ./../grmain.c

And here (with --disable-gracket):
./racket3m -cu "./collects-path.rkt" "/home/juanfra/racket/racket/bin/racket" ../collects ../etc