Temporarily revert these patches:

commit 60d9845f6a037122d9be9a6d92d4de617ef45b04
Author: Mehdi Amini <mehdi.amini@apple.com>
Date:   Fri Mar 11 18:48:02 2016 +0000

    Fix clang crash: when CodeGenAction is initialized without a
    context, use the member and not the parameter

    From: Mehdi Amini <mehdi.amini@apple.com>

    git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@263273
    91177308-0d34-0410-b5e6-96231b3b80d8

commit af7ce3bf04a75ad5124b457b805df26006bd215b
Author: Mehdi Amini <mehdi.amini@apple.com>
Date:   Fri Mar 11 17:32:58 2016 +0000

    Fix build: use -> with pointers and not .

    Silly typo.

    From: Mehdi Amini <mehdi.amini@apple.com>

    git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@263267
    91177308-0d34-0410-b5e6-96231b3b80d8

commit d0eea119192814954e7368c77d0dc5a9eeec1fbb
Author: Mehdi Amini <mehdi.amini@apple.com>
Date:   Fri Mar 11 17:15:44 2016 +0000

    Remove compile time PreserveName switch based on NDEBUG

    Summary:
    Following r263086, we are now relying on a flag on the Context to
    discard Value names in release builds.

    Reviewers: chandlerc

    Subscribers: cfe-commits

    Differential Revision: http://reviews.llvm.org/D18024

    From: Mehdi Amini <mehdi.amini@apple.com>

    git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@263257
    91177308-0d34-0410-b5e6-96231b3b80d8

until we can fix the Release builds.

This reverts commits 263257, 263267, 263273

llvm-svn: 263320