Check iscompilergenerated last in canberegistered for perf reasons

[RogerKratz]

Reimplements PR #994, please see that PR for more info what/why this fix is for.
We recently upgraded autofac and noticed that the fix was gone. This makes "test" AssemblyScanningPerformanceTests.MeasurePerformance perf better again.

[codecov]

Codecov Report

Merging #1289 (2924b26) into develop (3ca27f8) will increase coverage by 0.24%.
The diff coverage is 40.00%.

@@             Coverage Diff             @@
##           develop    #1289      +/-   ##
===========================================
+ Coverage    76.34%   76.58%   +0.24%     
===========================================
  Files          185      188       +3     
  Lines         4870     5181     +311     
  Branches      1004     1061      +57     
===========================================
+ Hits          3718     3968     +250     
- Misses         679      713      +34     
- Partials       473      500      +27     

Impacted Files	Coverage Δ
...nning/OpenGenericScanningRegistrationExtensions.cs	87.73% <40.00%> (-2.47%)	⬇️
src/Autofac/Core/Registration/ComponentRegistry.cs	86.36% <0.00%> (-8.09%)	⬇️
src/Autofac/Core/Registration/ModuleRegistrar.cs	95.23% <0.00%> (-4.77%)	⬇️
...stration/ComponentRegistrationLifetimeDecorator.cs	70.83% <0.00%> (-4.17%)	⬇️
...Autofac/Core/Registration/ComponentRegistration.cs	76.74% <0.00%> (-0.48%)	⬇️
src/Autofac/Core/Container.cs	68.96% <0.00%> (ø)
...ctivators/Reflection/AutowiringPropertyInjector.cs	100.00% <0.00%> (ø)
...ilder{TLimit,TActivatorData,TRegistrationStyle}.cs	76.44% <0.00%> (ø)
src/Autofac/Features/Metadata/Meta{T,TMetadata}.cs	100.00% <0.00%> (ø)
...c/Autofac/Core/Registration/ModuleRegistrarData.cs	100.00% <0.00%> (ø)
... and 7 more

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[tillig]

Not sure how this got lost in the mix, but... whoops! Thanks for the PR and the patience.

[RogerKratz]

Perfect! A new release would be highly appreciated.

[tillig]

6.3.0 is cut!

[alistairjevans]

If that scanning method is a hot path, it may also be worth looking at reducing the LINQ usage in future, it's possible there's additional allocations happening inside the Where loop that we could avoid to save some extra CPU.