Go apparently didn't do SSA until 1.7. Then again it's not exactly an optimising compiler.
It's also somewhat common for functional language implementations to use CPS rather than SSA e.g. ghc does CPS conversion rather than SSA, and apparently didn't even used to do that: https://stackoverflow.com/a/8031177/8182118
It's also somewhat common for functional language implementations to use CPS rather than SSA e.g. ghc does CPS conversion rather than SSA, and apparently didn't even used to do that: https://stackoverflow.com/a/8031177/8182118