Patch MemoryOwnerExtensions to workaround #987

[antonfirsov]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

See this issue comment for explanation. May workaround #987 for (some? all?) users.

[Sergio0694]

@antonfirsov The CI just hung itself again on .NET 626 32bit with the usual out of memory error, just trigger the build again when you have some time 👍

[JimBobSquarePants]

@Sergio0694 I've given it a kick.

[codecov]

Codecov Report

Merging #991 into master will decrease coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #991      +/-   ##
==========================================
- Coverage   89.74%   89.63%   -0.12%     
==========================================
  Files        1098     1098              
  Lines       48690    48690              
  Branches     3433     3433              
==========================================
- Hits        43698    43643      -55     
- Misses       4288     4293       +5     
- Partials      704      754      +50

Impacted Files	Coverage Δ
src/ImageSharp/Memory/MemoryOwnerExtensions.cs	85.71% <ø> (ø)	⬆️
...xelFormats/PixelOperations{TPixel}.PixelBenders.cs	89.9% <0%> (-10.1%)	⬇️
...olorSpaces/Conversion/ColorSpaceConverter.Adapt.cs	60% <0%> (-8.58%)	⬇️
...Processing/Processors/Transforms/TransformUtils.cs	87.64% <0%> (-6.75%)	⬇️
src/ImageSharp/Primitives/ValueSize.cs	78.94% <0%> (-5.27%)	⬇️
src/ImageSharp/Common/Helpers/ImageMaths.cs	82.05% <0%> (-5.13%)	⬇️
....Tests/TestUtilities/Tests/TestEnvironmentTests.cs	63.63% <0%> (-4.55%)	⬇️
...p/Processing/Processors/Dithering/ErrorDiffuser.cs	93.75% <0%> (-3.13%)	⬇️
...ocessors/Transforms/AutoOrientProcessor{TPixel}.cs	82.35% <0%> (-2.95%)	⬇️
...ormats/Jpeg/Components/Decoder/QualityEvaluator.cs	94.04% <0%> (-2.39%)	⬇️
... and 20 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #991 into master will decrease coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #991      +/-   ##
==========================================
- Coverage   89.74%   89.63%   -0.12%     
==========================================
  Files        1098     1098              
  Lines       48690    48690              
  Branches     3433     3433              
==========================================
- Hits        43698    43643      -55     
- Misses       4288     4293       +5     
- Partials      704      754      +50

Impacted Files	Coverage Δ
src/ImageSharp/Memory/MemoryOwnerExtensions.cs	85.71% <ø> (ø)	⬆️
...xelFormats/PixelOperations{TPixel}.PixelBenders.cs	89.9% <0%> (-10.1%)	⬇️
...olorSpaces/Conversion/ColorSpaceConverter.Adapt.cs	60% <0%> (-8.58%)	⬇️
...Processing/Processors/Transforms/TransformUtils.cs	87.64% <0%> (-6.75%)	⬇️
src/ImageSharp/Primitives/ValueSize.cs	78.94% <0%> (-5.27%)	⬇️
src/ImageSharp/Common/Helpers/ImageMaths.cs	82.05% <0%> (-5.13%)	⬇️
....Tests/TestUtilities/Tests/TestEnvironmentTests.cs	63.63% <0%> (-4.55%)	⬇️
...p/Processing/Processors/Dithering/ErrorDiffuser.cs	93.75% <0%> (-3.13%)	⬇️
...ocessors/Transforms/AutoOrientProcessor{TPixel}.cs	82.35% <0%> (-2.95%)	⬇️
...ormats/Jpeg/Components/Decoder/QualityEvaluator.cs	94.04% <0%> (-2.39%)	⬇️
... and 20 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 02d1f1b...9f93b09. Read the comment docs.