[JamesNK]

Used by AuthorizationMiddleware. Want to avoid allocations when there is no policy to evaluate.

Hide whitespace for best reviewing experience.

On #1894

[davidfowl]

Where's the before and after number

[JamesNK]

Note: I added caching to policy provider tasks.

Before:

       Method |     Mean |    Error |   StdDev |        Op/s |  Gen 0 | Allocated |
------------- |---------:|---------:|---------:|------------:|-------:|----------:|
 CombineAsync | 100.7 ns | 2.348 ns | 4.174 ns | 9,927,843.4 | 0.0203 |     184 B |

After:

       Method |     Mean |     Error |    StdDev |         Op/s | Allocated |
------------- |---------:|----------:|----------:|-------------:|----------:|
 CombineAsync | 57.57 ns | 0.5720 ns | 0.5351 ns | 17,371,422.1 |       0 B |

More changes