bctr and blr must ignore the two lsb

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1438 c046a42c-6fe2-441c-8c8c-71466251a162

target-ppc/op.c

@@ -446,7 +446,7 @@ PPC_OP(b)
 
 PPC_OP(b_T1)
 {
-    regs->nip = T1;
+    regs->nip = T1 & ~3;
 }
 
 PPC_OP(btest)