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[mir-opt] Allow debuginfo to be generated for a constant or a Place
source link: https://github.com/rust-lang/rust/pull/73210
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wesleywiser commented on Jun 10
Prior to this commit, debuginfo was always generated by mapping a name
to a Place. This has the side-effect that SimplifyLocals cannot remove
locals that are only used for debuginfo because their other uses have
been const-propagated.
To allow these locals to be removed, we now allow debuginfo to point to
a constant value. The ConstProp pass detects when debuginfo points to
a local with a known constant value and replaces it with the value. This
allows the later SimplifyLocals pass to remove the local.
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