Add `muldiv_c` and `muxadd` peepopts #1562

Job	Run time
pre_job	4s
Build nix flake (ubuntu-latest)	10m 49s
Prepare Visual Studio build	30s
Build nix flake (macos-latest)	6m 29s
WASI build	20m 11s
Visual Studio build	11m 31s
	49m 34s

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