https://github.com/bitcoin/bitcoin/commit/172f006020965ae8763a0610845c051ed1e3b522

this one is for validation; the other link you posted is for mining.

if you look at the diff on github, just above the context is their best guess at the most relevant enclosing scope; and there you can see that the other commit you linked introduced the limit for the blocks generated by the CPU miner, while this commit enforces them in verification.

Or is it this from July 2010:
https://github.com/bitcoin/bitcoin/commit/a30b56ebe76ffff9f9cc8a6667186179413c6349