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This adds and tests the new method. It will be used in a new pass later, where
computing shallow hashes allows it to be done in linear time.
99% of the diff is whitespace.
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Before this we would assert on hashing e.g. (br $x) by itself, without the
context so we recognized the name $x. Somehow that was not an issue
until delegate, we just happened to not hash such things. I believe I remember
that @aheejin noticed this issue before, but given we didn't have a testcase,
we deferred fixing it - now is the time, I guess, as with delegate it is easy to
get e.g. CodeFolding to hash a Try with a delegate.
Issue found by emscripten-core/emscripten#13485
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Expands on #3294:
* Scope names must be distinguished as either defs or uses.
* Error when a core #define is missing, which is less error-prone, as
suggested by @tlively
* Add DELEGATE_GET_FIELD which lets one define "get the field"
once and then all the loops can use it. This helps avoid boilerplate for
loops at least in some cases (when there is a single object on which
to get the field).
With those, it is possible to replace boilerplate in comparisons and
hashing logic. This also fixes a bug where BrOnExn::sent was not
scanned there.
Add some unit tests for hashing. We didn't have any, and hashing can be
subtly wrong without observable external effects (just more collisions).
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