aarch64: align address for BTI protection [BZ #26988]
Handle unaligned executable load segments (the bfd linker is not
expected to produce such binaries, but other linkers may).
Computing the mapping bounds follows _dl_map_object_from_fd more
closely now.
Fixes bug 26988.
Reviewed-by:
Adhemerval Zanella <adhemerval.zanella@linaro.org>
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