tree b9b1cfd1fc9c8bbdcf8c5ddc456e0811f3d62dd6
parent 8404f670f5bda1efb60076c701613b86b576533d
author Sebastian Redl <sebastian.redl@getdesigned.at> 1281659283 +0000
committer Sebastian Redl <sebastian.redl@getdesigned.at> 1281659283 +0000

Instead of modifying the ObjC AST to not modify existing declarations, teach chained PCH to overwrite declarations from earlier PCH files in dependent ones. Tell Sema to note when it changes AST nodes so that they have to be reserialized. Finally, the ObjCProtocolDecls created in forward decls, like the ObjCInterfaceDecls in @class forward decls, are not lexically part of the decl context; only the definition is.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@110989 91177308-0d34-0410-b5e6-96231b3b80d8