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We already did this for nullablilty, and so for the same reasons we should do it
for heap types as well. Also, I realized that doing so would solve #5703, which
is the new test added for TypeRefining here.
The fuzz bug solved here is that our analysis of struct gets/sets will skip
copy operations - a read from a field that is written into it. And we skip
fallthrough values while doing so, since it doesn't matter if the read goes
through an if arm or a cast. An if would automatically get a more precise
type during refinalize, so this PR does the same for a cast basically.
Fixes #5703
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The standard casting instructions now allow casting to basic heap types, not
just user-defined types, but they also require that the intended type and
argument type have a common supertype. Update the validator to use the standard
rules, update the binary parser and printer to allow basic types, and update the
tests to remove or modify newly invalid test cases.
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We previously supported only the non-standard cast instructions introduced when
we were experimenting with nominal types. Parse the names and opcodes of their
standard counterparts and switch to emitting the standard names and opcodes.
Port all of the tests to use the standard instructions, but add additional tests
showing that the non-standard versions are still parsed correctly.
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