1.0.41.26: ppc: Calling-convention fixes for static-fun VOPs.

1.0.41.26: ppc: Calling-convention fixes for static-fun VOPs.

  * Instead of having the static-fun VOPs work with the fdefn
raw-addr slot directly, have them first load reg_FDEFN with the
static-fdefinition object and then perform the critical part of
the normal call sequence.

  * This covers the usual race condition, etc. involved in dealing
with an fdefn-raw-addr without first loading the function, and
allows (PPC only) the use of funcallable instances and closures as
static-functions (unlikely as that is).