In the latest episode of "Deserializing bugs caused by accessors" the series...

In the latest episode of "Deserializing bugs caused by accessors" the series reached a thrilling climax when
FunctionDecl::setPure crashed a poor user's code.

Remove the use of this accessor when deserializing, along with several other in the neighborhood. Fixes rdar://8759653.

llvm-svn: 122756