Add PCH read/write support for Objective-C Selectors.

Note: This support is non-lazy. Once we get "Cocoa.h" humming, we can optimize this.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69884 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed