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This change splits the LOAD segments so the [l, r) range is located in
its separate segment to make removal of it in the later stages
possible.

This change also moves the logic of resizing the segments after adding
new program header to AddPhdr method.

Bug: 998082
Change-Id: Ibec04434caea993ffddb73bcd1771730f2bd1e9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795448
Commit-Queue: Denis Solonkov <solonkovda@google.com>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697151}