(compilation-error-regexp-alist-alist): Also recognize severe Irix et al. messages.
(compilation-normalize-filename, compile-abbreviate-directory): Delete functions. (compilation-get-file-structure): New function inherits functionality of the two preceding ones. (compilation-internal-error-properties, compilation-fake-loc): Use it so that different paths to the same file share the same markers. Also optimize finding adjacent marker slightly.
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