Set default thread count to 1 for debug builds.

Change-Id: I14673f17ef0f299a7ead5bc55bd6729f37759b19
Reviewed-on: https://swiftshader-review.googlesource.com/3870
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Greg Hartman <ghartman@google.com>
1 file changed