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The IR is indeed a tree, but not an "abstract syntax tree" since there is no language for which it is the syntax (except in the most trivial and meaningless sense).
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* translate asm.js atomics into wasm atomics
* fix wasm-builder atomic load emitting, the alignment is the loaded size, not the output size
* don't require code for each node type in vaccuum, for non-mentioned nodes, assume we can't optimize them out
* support atomics in hashing, comparing, and copying
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* Teach EffectAnalyzer not to reorder atomics wrt other memory operations.
* Teach EffectAnalyzer not to reorder host operations with memory operations
* Teach various passes about the operands of AtomicRMW and AtomicCmpxchg
* Factor out some functions in DeadCodeElimination and MergeBlocks
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* address review feedback for #1014
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* validate that types are properly finalized, when in pass-debug mode (BINARYEN_PASS_DEBUG env var): check after each pass is run that the type of each node is equal to the proper type (when finalizing it, i.e., fully recomputing the type).
* fix many fuzz bugs found by that.
* in particular, fix dce bugs with type changes not being fully updated during code removal. add a new TypeUpdater helper class that lets a pass update types efficiently, by the helper tracking deps between blocks and branches etc., and updating/propagating type changes only as necessary.
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Split ExpressionAnalyzer and ExpressionManipulator into cpp files, and turn their giant template functions into simple functions which take a callback.
More organization, fewer mammoth headers, makes the build a few seconds faster, and the binaries a couple MB smaller.
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