[BUG] likwid-bench: stream size number only up to 2^31

[aw32]

In likwid-bench one can only specify the stream size up to 2^31.
Afterwards, the following message is printed:

Stream size cannot be read, should look like <domain>:<size>

If one specify exact Byte numbers, one can only go up to around 2GB.

[TomTheBear]

True, this is an issue by using only an int for the stream size argument. We should use a 64bit integer for it.

As written already in your other issue, we are rewriting likwid-bench. This does not mean that changes to the current likwid-bench are not accepted.