Implement the virtual getNextRedeclaration() for ObjCMethodDecl.

If it's in an ObjCContainerDecl, its "redeclaration" is the method definition in the corresponding ObjCImplDecl.
If it's in an ObjCImplDecl, its "redeclaration" is the method in the interface.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@76512 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed