Use a non-blocking lock for the streaming vertex buffer

Change-Id: I85f6306434f5810dd8357eeeedfb764bf2318668
Reviewed-on: https://swiftshader-review.googlesource.com/3411
Tested-by: Maxime Grégoire <mgregoire@google.com>
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
3 files changed