Begin implementing a cache of special member lookups. Currently only
destructors are implemented but other special members are on the way,
which is where the real benefits of this will be visible.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@132572 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed