[libclang] Fix use-after-free bug when handling attributes indexing info.

When indexing a property with a getter/setter with attributes, the allocated memory
for AttrListInfo could get released before its destructor is run.

Fixes rdar://11113442.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153792 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed