[pirc/new] improve allocation of PASM registers: only give a symbol a PASM register if it's actually used, not when merely declaring it. This prevents assigning (valuable) PASM registers to unused (but declared) symbols.
[pirc/new] improve allocation of PASM registers: only give a symbol a PASM register if it's actually used, not when merely declaring it. This prevents assigning (valuable) PASM registers to unused (but declared) symbols.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@30565 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot