The purpose of this patch is to keep the same functionality without using LookupResult's implicit copy ctor and assignment operator, because they cause warnings when -Wdeprecated is passed.
This patch is meant to help the following review: http://reviews.llvm.org/D18123.
The functionality is covered by the tests in my original commit (255890)
The test case in this patch was added to test a bug caught in the review of the first version of this fix.

Differential Revision: http://reviews.llvm.org/D18175


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@263630 91177308-0d34-0410-b5e6-96231b3b80d8