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Port changes related to homogeneous aggregate recognition #8198
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• Change FieldLayoutAlgorithm.ComputeValueTypeShapeCharacteristics method to compute the homogeneous aggregate element type and cache it in the existing field. That allows to remove all ComputeHomogeneousFloatAggregateElementType methods. • Change MetadataFieldLayoutAlgorithm.ComputeHomogeneousAggregateCharacteristic to compute HVAs in addition to HFAs. • Change CorInfoImpl.getHFAType JIT callback to handle HVAs. Note that returning ELEMENT_TYPE_VALUETYPE indicates the TYP_SIMD16 type (see Compiler::GetHfaType).
In an earlier change I also added the `type.Instantiation[0].IsPrimitive` condition to the `IsVectorType` predicate. Revert that part as well and allow only primitive numeric types for HFA/HVA purpose.
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dotnet/runtime#35576
dotnet/runtime#35864
dotnet/runtime#36673