/usr/src/gcc-8/debian/patches/svn-commit.tmp is in gcc-8-source 8-20180414-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | - update libphobos patch for new snapshot
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M libphobos-zlib.diff
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