Add `muldiv_c` and `muxadd` peepopts #1526

Job	Run time
pre_job	6s
test-compile (ubuntu-latest, clang-14)	11m 18s
test-compile (ubuntu-latest, gcc-10)	11m 37s
test-compile (ubuntu-latest, clang-18)	21m 51s
test-compile (ubuntu-latest, gcc-13)	24m 25s
test-compile (macos-13, clang)	16m 50s
test-compile (ubuntu-20.04, clang-10)	12m 13s
	1h 38m 20s

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