PPC32/64: Allow 16 byte icache lines.
Partial fix for #308135.  (christophe.leroy@c-s.fr)


git-svn-id: svn://svn.valgrind.org/vex/trunk@2785 8f6e269a-dfd6-0310-a8e1-e2731360e62c
Add support for an alternative encoding of 'PUSH reg', viz FF /6,
that is used by MSVC generated code.  Fixes #324834.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2786 8f6e269a-dfd6-0310-a8e1-e2731360e62c