[clang] [Clang] Make matrix type trivially copyable (PR #193634)

[Farzon Lotfi via cfe-commits]

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farzonl wrote:

```suggestion
  if (CanonicalType->isDependentType())
    return false;

  if (CanonicalType->isSizelessBuiltinType())
    return true;

  // Return false for incomplete types after skipping any incomplete array types
  // which are expressly allowed by the standard and thus our API.
  if (CanonicalType->isIncompleteType())
    return false;

  if (CanonicalType.hasAddressDiscriminatedPointerAuth())
    return false;

  // As an extension, Clang treats vector and Matrix types as Scalar types.
  if (CanonicalType->isScalarType() || CanonicalType->isVectorType() || CanonicalType->isMatrixType())
```

https://github.com/llvm/llvm-project/pull/193634