merge GCC 10.4 into gcc.old.

merge GCC 9.3 into gcc.old.

merge GCC 8.4 into gcc.old.

merge GCC 7.5.0 into gcc.old. .. just in time to be obsolete? :)

merge gcc 7.4 into gcc.old part 2.

merge GCC 6.5.0 into gcc.old.

merge GCC 6.4 into gcc.old.

merge GCC 5.4 into gcc.old.

re-merge GCC 4.8.5 (part 1)

import the -current GCC 4.5 sources as gcc.old in preparation for
upgrading the normal GCC to 4.8.

this tree has had ChangeLog entries removed, as well as all the
other components we delete, and "on

import the -current GCC 4.5 sources as gcc.old in preparation for
upgrading the normal GCC to 4.8.

this tree has had ChangeLog entries removed, as well as all the
other components we delete, and "only" weighs in around 140MB now.

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