[index] Index the deleted functions

rdar://32323386

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@303563 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 15b4f09a3358c00571527bf26e9f31f942b50713)
2 files changed