Hamish Knight 8cb319b640 [Refactoring] Preserve comments in async transform ...

Previously we would drop comments between nodes in
a BraceStmt, as we printed each node out individually.
To remedy this, always make sure we scan backwards
to find any preceding comments attached to a node,
and also keep track of any SourceLocs which we
don't print, but may have comments attached which
we want to preserve.

rdar://77401810

2021-05-13 14:16:27 +01:00

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