Do not assume support for multisampled wide lines.

Do not assume support for multisampled wide lines.

- Allow rasterization, interpolation, and clipping multisampled wide
  line cases to fail and report Compatibility Warning instad of
  failure.
- Allow line width verification failures in primitive bounding box
  tests (and generate compatibility warning).
- Not modiyfing helper_invocation cases since the test tolerate
  uncertain line rendering widths.

Bug: 20453464
Change-Id: Ib1ef997c5476e04a02a103f0636201ed94c9354e