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Add a utility for calculating the least upper bounds of two StackSignatures,
taking into account polymorphic unreachable behavior. This will important in the
finalization and validation of Poppy IR blocks, where a block is allowed to
directly produce fewer values than the branches that target it carry if the
difference can be made up for by polymorphism due to an unreachable instruction
in the block.
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This avoids needing to add include wasm-printing if a file doesn't already have it.
To achieve that, add the std::ostream hooks in wasm.h, and also use them
when possible, removing the need for the special WasmPrinter object.
Also stop printing in "full" (print types on each line) in error messages by default. The
user can still get that, as always, using BINARYEN_PRINT_FULL=1 in the env.
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Also includes a lot of new spec tests that eventually need to go into the spec repo
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Implement and test utilities for manipulating and analyzing a new
stacky form of Binaryen IR that is able to express arbitrary stack
machine code. This new Poppy IR will eventually replace Stack IR, and
new optimization passes will be built with these utilities. See #3059.
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