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rust: Preallocate the returned `Vec` in `utils::files::relativize_path`...

rust: Preallocate the returned `Vec` in `utils::files::relativize_path` Profiling `rhg files > /dev/null` on an old snapshot of mozilla-central (with `perf` and the Firefox Profiler: https://github.com/firefox-devtools/profiler/blob/main/docs-user/guide-perf-profiling.md) showed non-trivial time spend in this function and in `realloc`. This change makes the wall-clock time for that process on my machine go from ~190 ms to ~150 ms. Differential Revision: https://phab.mercurial-scm.org/D10199

Alexander Plavin - - Load All Authors

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             diffstat.tmpl
        
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        <tr>

          <td class="diffstat-file"><a href="#l{fileno}.1">{file|escape}</a></td>

          <td class="diffstat-total" align="right">{total}</td>

          <td class="diffstat-graph">

            <span class="diffstat-add" style="width:{addpct}%;">&nbsp;</span>

            <span class="diffstat-remove" style="width:{removepct}%;">&nbsp;</span>

          </td>

        </tr>

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				<tr>
				<td class="diffstat-file"><a href="#l{fileno}.1">{file\|escape}</a></td>
				<td class="diffstat-total" align="right">{total}</td>
				<td class="diffstat-graph">
				<span class="diffstat-add" style="width:{addpct}%;"> </span>
				<span class="diffstat-remove" style="width:{removepct}%;"> </span>
				</td>
				</tr>