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Add a `visitFunctionStart` function to IRBuilder and make it responsible for
setting the function's body when the context is closed. This will simplify
outlining, will be necessary to support branches to function scope properly, and
removes an extra block around function bodies in the new wat parser.
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The new wat parser previously returned InstrT types when parsing individual
instructions and collected InstrsT types when parsing sequences of instructions.
However, instructions were always actually tracked in the internal state of the
parsing context, so these types never held any interesting or necessary data.
Simplify the parser by removing these types and leaning into the pattern that
the parser context will keep track of parsed instructions.
This allows for a much cleaner separation between the `instrs` and
`foldedinstrs` parser functions.
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And put the new files in a new source directory, "parser". This is a rough split
and is not yet expected to dramatically improve compile times. The exact
organization of the new files is subject to change, but this splitting should be
enough to make further parser development more pleasant.
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