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We automatically copy debuginfo in replaceCurrent(), but there are a few
places that do other operations than simple replacements. call-utils.h will
turn a call_ref with a select target into two direct calls, and we were missing
the logic to copy debuginfo from the call_ref to the calls.
To make this work, refactor out the copying logic from wasm-traversal, into
debuginfo.h, and use it in call-utils.h.
debuginfo.h itself is renamed from debug.h (as now this needs to be included
from wasm-traversal, which nearly everything does, and it turns out some files
have internal stuff like a debug() helper that ends up conflicing with the old
debug namespace).
Also rename the old copyDebugInfo function to copyDebugInfoBetweenFunctions
which is more explicit. That is also moved from the header to a cpp file because
it depends on wasm-traversal (so we'd end up with recursive headers otherwise).
That is fine, as that method is called after copying a function, which is not that
frequent. The new copyDebugInfoToReplacement (which was refactored out of
wasm-traversal) is in the header because it can be called very frequently (every
single instruction we optimize) and we want it to get inlined.
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