When a boxed array is privatized via `omp.private`, the `SourceKind` of
the loaded box data was being misclassified as `SourceKind::Indirect` by
the alias analyzer. Instead its `SourceKind::Allocate` should be
preserved. This caused AliasAnalysis to conservatively return `MayAlias`
for accesses to privatized arrays vs dummy arguments. This prevented
InlineHLFIRAssign from inlining array section assignments.
Propagate the Allocate source kind when the box source is classified as
`Allocate`, so that alias analysis correctly returns `NoAlias`.
40a6180cea