perf tools: Fix perf-with-kcore handling of arguments containing spaces

Fix the perf-with-kcore script so that it doesn't split arguments that
contain spaces.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1437150840-31811-13-git-send-email-adrian.hunter@intel.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>