Add `muldiv_c` and `muxadd` peepopts #1528

Job	Run time
pre_job	4s
test-compile (ubuntu-latest, clang-14)	10m 59s
test-compile (ubuntu-latest, gcc-10)	11m 41s
test-compile (ubuntu-latest, clang-18)	21m 11s
test-compile (ubuntu-latest, gcc-13)	24m 58s
test-compile (macos-13, clang)	13m 2s
test-compile (ubuntu-20.04, clang-10)	12m 11s
	1h 34m 6s

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