tckglobal: Fix erroneous -niter parsing for values bigger that 1.4e9

[sertopexamgio]

The tckglobal command when run with -niter 10B could only run for 1410065408 iterations instead of 10000000000 iterasions. These changes fixed the parsing issue.

[Lestropie]

Hey @sertopexamgio,

Awesome to see some external pull requests coming in!

For this one, rather than expanding the code out to multiple lines, you can instead exploit the fact that get_option_value() is a templated function. This is typically inferred from the type of the default value, which in this case is a macro that the compiler will presumably interpret as an int. If you were to instead explicitly invoke get_option_value<uint64_t>(), that would be fractionally neater.

Cheers!
Rob

[sertopexamgio]

Hey @Lestropie,

thanks for your review, that was a neat suggestion.
I hope it looks good now.
Have a good one!

Cheers!
Serxhio

[dchristiaens]

I concur with @Lestropie that

uint64_t niter = get_option_value<uint64_t>("niter", DEFAULT_NITER);

would be the cleaner syntax. Nice addition and thanks for contributing!