Turn pretty-printing of a declaration into a request #76813
Merged
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The diagnostics engine has some code to pretty-print a declaration when there is no source location for that declaration. The declaration is pretty-printed into a source buffer, and a source location into that buffer is synthesizes. This applies to synthesized declarations as well as those imported from Swift modules (without source code) or from Clang.
Reimplement this pretty-printing for declarations as a request. In doing so, change the manner in which we do the printing: the diagnostics engine printed the entire enclosing type into a buffer whose name was the module + that type. This meant that the buffer was shared by every member of that type, but also meant that we would end up deserializing a lot of declarations just for printing and potentially doing a lot more work for these diagnostics.