Remove DUCE.CopyBytes

[ThomasGoulet73]

Description

Removes DUCE.CopyBytes that was used to set struct fields. It was probably used in the past to improve performance but since then the JIT has improved and is faster than custom memcopy, thanks in part to SIMD.

LinearGradientBrush and RadialGradientBrush were the only 2 of many DUCE resources to use this method.

Benchmark results (Copying 5 double to a struct)

Method	Mean	Error	StdDev	Ratio	Code Size
CopyBytes	6.8878 ns	0.0178 ns	0.0158 ns	1.00	150 B
JIT	0.8358 ns	0.0050 ns	0.0044 ns	0.12	46 B

Customer Impact

Slightly better performance.

Regression

No.

Testing

Local testing.

Risk

Low.

Microsoft Reviewers: Open in CodeFlow