message: Add 'const' to constexpr to prevent "error C2131: expression did not evaluate to a constant" on MSVC.
diff: @@ -23,7 +23,9 @@ limitations under the License.
  namespace xla {
  namespace gpu {
  -constexpr absl::string_view kDefaultBlacklist = R"pb(
  +// MSVC requires the extra const. Without, it reports an
  +// "error C2131: expression did not evaluate to a constant".
  +constexpr const absl::string_view kDefaultBlacklist = R"pb(
  entries {
  hlo: "(f16[256,112,112,64]{3,2,1,0}, u8[0]{0}) custom-call(f16[256,224,224,4]{3,2,1,0}, f16[7,7,4,64]{2,1,0,3}), window={size=7x7 stride=2x2 pad=3_3x3_3}, dim_labels=b01f_01io->b01f, custom_call_target=\"__cudnn$convForward\", backend_config=\"{conv_result_scale:1}\""
  cc { major: 7 }
  