The pipeline code doesn't need to know whether we're drawing Bresenham
lines or anything else. It just needs to know whether or not to enable
multisample rasterization for a multisample render target.

Also rename multiSample to multiSampleCount.

Bug: b/142965928
Change-Id: I34395e90d502c49cd13e0087d4b323d222cb2064
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40169
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>