Skip setting fields when the ctor already took the value #1314
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This re-enables setting
readonlyfields (which used to work till #1218) was fixed.To avoid regressing the test that the fix for #1218 added, I also suppress setting fields with values that have already been passed to constructors.
This is a behaviorally observable change.
Fixes #1308
MPC comparison
The new behavior is consistent with mpc-generated code. For this type:
https://github.com/neuecc/MessagePack-CSharp/blob/14556ae3bb41a8807b5a93c9d6a7793bd5d9ab3e/src/MessagePack.UnityClient/Assets/Scripts/Tests/Class1.cs#L679-L693
mpc generates code that only invokes the constructor and returns the result:
https://github.com/neuecc/MessagePack-CSharp/blob/14556ae3bb41a8807b5a93c9d6a7793bd5d9ab3e/sandbox/Sandbox/Generated.cs#L3455-L3457