/usr/src/gcc-4.6/debian/patches/cell-branch.diff is in gcc-4.6-source 4.6.4-6ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # DP: Updates from the cell-4_5-branch up to 2010xxxx
svn diff svn://gcc.gnu.org/svn/gcc/branches/gcc-4_5-branch@xxxx svn://gcc.gnu.org/svn/gcc/branches/cell-4_5-branch
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