Add `muldiv_c` and `muxadd` peepopts #1527

Job	Run time
pre_job	4s
test-compile (ubuntu-latest, clang-14)	10m 52s
test-compile (ubuntu-latest, gcc-10)	11m 52s
test-compile (ubuntu-latest, clang-18)	21m 19s
test-compile (ubuntu-latest, gcc-13)	24m 57s
test-compile (macos-13, clang)	13m 39s
test-compile (ubuntu-20.04, clang-10)	12m 1s
	1h 34m 44s

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