Make rebuilds without code changes take less time#1086

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toshok wants to merge 1 commit intomasterfrom

toshok/make-rebuilds-quicker

Commits on Jan 26, 2024

don't unconditionally write record_replay_driver.{h,cc} - only write them if they've changed. drops local mac arm build (on no local change, with no driver change) from 45s to 15s
toshok
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