[DebugInfo] Improve documentation & Fix discovered bugs #73276
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adrian-prantl
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Apr 29, 2024
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Adds more documentation about updating debug values, and debug value expressions.
Fixes a few bugs: undef debug values being removed, constant debug values not working, arithmetic without a deref not working.
Add support for salvaging integer literals.
This increases the number of debug variables in the standard library by 1.7%
The biggest improvements in the amount of lost variables are: constant propagation (-81%), sil combine (-50%), dead code elimination (-31%), copy propagation (-59%), common subexpression elimination (-24%)