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c93a0e5e42 Implement canonicalization of Value and Element (#3024 )

See arena.h for discussion of what canonicalization means in this
context. This is primarily intended to support implementing a memo table
of template instantiations to resolve #2951, but could be useful for
other purposes as well.

Additional changes:
- Pass `VTable` constructor parameters by pointer, to avoid the need to
define `operator==` and `hash_value` for it.
- Clean up the recurring pattern of allocating identical `NamedElement`s
on the stack and heap. Instead we always allocate it on the heap and
pass it by pointer.
- Add `Print()` and `Dump()` to `Bindings` as a debugging convenience.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Co-authored-by: Richard Smith <richard@metafoo.co.uk>

2023-08-03 16:05:59 +00:00

arena_test.cpp

Implement canonicalization of Value and Element (#3024 )

2023-08-03 16:05:59 +00:00

arena.h

Implement canonicalization of Value and Element (#3024 )

2023-08-03 16:05:59 +00:00

BUILD

Implement canonicalization of Value and Element (#3024 )

2023-08-03 16:05:59 +00:00

decompose_test.cpp

Implement canonicalization of Value and Element (#3024 )