When clearing a multisampled buffer, the reactor blitter was only clearing the first sample. This cl makes the reactor blitter effectively clear all samples of a multisampled buffer. Change-Id: I7ce1af401bf537fe85e1c8393a2c57144641ad8e Reviewed-on: https://swiftshader-review.googlesource.com/18032Tested-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com>
