Prepare `MutVisitor`s to handle interned projections#65197

Merged

bors merged 12 commits intorust-lang:masterfrom

spastorino:place-mut-visitor-adjusts2

Oct 19, 2019

Commits on Oct 18, 2019

super_ty on MutVisitor is empty so avoid the call
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Prepare promote_consts MutVisitor to have projections interned
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Prepare simplify MutVisitor to have projections interned
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Prepare renumber MutVisitor to have projections interned
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Prepare inline MutVisitor to have projections interned
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Prepare generator MutVisitor to have projections interned
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Prepare erase_regions MutVisitor to have projections interned
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Prepare def_use MutVisitor to have projections interned
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Remove unneeded callback and just use the new_local value
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Setup a different visit place set of methods for mutable and immutable visitors
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Add process_* place hooks to improve code reutilization
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Use Cow to handle modifications of projection in preparation for interning
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