JuliaLang / julia / #37536

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abstractarray: fix `append!(::AbstractVector, ...)` interface (#49754)

JuliaLang/julia#47154 mistakenly added `@_safeindex` macro on the
`_append!(a::AbstractVector, ::Union{HasLength,HasShape}, iter)` method,
although `@_safeindex` is only valid for builtin vectors i.e. `Vector`.

This commit adds `isa` check so that `@_safeindex` is only applied to
builtin vectors. The `isa` check should be removed at compile time, so
it should not affect the runtime performance.

closes #49748

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