Add `muldiv_c` and `muxadd` peepopts #1543

Job	Run time
pre_job	5s
Build nix flake (ubuntu-latest)	15m 9s
Build nix flake (macos-latest)	9m 47s
Prepare Visual Studio build	32s
WASI build	19m 52s
Visual Studio build	10m 43s
	56m 8s

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