[PATCH] x86-64: deflate inflate_dynamic too

inflate_dynamic() has piggy stack usage too, so heap allocate it too.
I'm not sure it actually gets used, but it shows up large in "make
checkstack".

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>