Fix dumping of call cost in tail recursion optimization

Fix dumping of call cost in tail recursion optimization

When tail recursion optimization is detected (i.e. a jump to the
beginning of the function without creating a new stack frame),
Callgrind collects this as real call (ie. calculates inclusive
call costs), but forgot to dump the call information (the call
type is still left as a jump).
Fixed by also dump call information if inclusive cost is >0.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@10780