Clear stack map data structures upon FunctionBuilderContext
reuse
#8962
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We were previously failing to clear
self.stack_map_vars
andself.stack_map_values
. Clearingself.dfs
is not strictly necessary, since callingself.dfs.iter()
internally clears its internal data before iteration begins, but its nice to tidy up anyways. Additionally, match on all the fields ofself
so that if we add more, we get compiler errors to remind us to clear the new fields as well.