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Summary
Note that this PR builds on #3377, and the commits won't make sense unless that's merged. This PR is draft until then.
Additionally since there needs to be another round of rebuilds for these packages to complete bootstrapping I've left GCC building in a faster mode. I'll switch back to the slower profile for the second round of rebuilds.
Also, building GCC with PIE has added a lot of items to the ABI report. I took a look in the diff at the actual changes to libgcc and libstd++ and there was nothing that looked problematic.