Add negative and subtraction number evaluation
Add negative and subtraction number evaluation

If a constant has a negative number in processing symbols, the
parser will fail. This patch adds handling of both negative numbers
and subtraction.

Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd