ObjCInterfaceDecl::lookupInstanceMethod() needs to look through a categories protocols.

Fixes <rdar://problem/6418640> clang on prokit: error: incompatible type returning 'id', expected 'NSSize'



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60716 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed