It’s not a RISC thing - CISC implementations do exactly the same kind of fusion for similar pairs of operations.
It has a bit less gain on a RISC due to the code density (or lack thereof), since it requires more fetch bandwidth. Apple works around this by using a very wide front-end: https://news.ycombinator.com/item?id=25257932
x86-64 code density is more than 4 bytes / instruction.