Prep for merging 3.4: Undo changes from 3.3 branch

Prep for merging 3.4: Undo changes from 3.3 branch

In order to cleanly merge LLVM 3.4, we must first undo the various
changes we've merged from LLVM's 3.3 branch, for two reasons:

 * To avoid merge conflicts where the same (or slightly different)
   changes appear in both LLVM's 3.3 branch and LLVM trunk.

 * To remove changes that were applied in the 3.3 branch and not on
   trunk, such as updating config scripts to refer to "3.3".

I made this change by doing:

git diff $(git merge-base upstream/master upstream/release_33)..$(git merge-base upstream/release_33 origin/master) > tmp_patch
git apply --index --reverse tmp_patch

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3757
TEST=none

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-clang.git;a=commit;h=d346cc0b6029ce81a5ef0bf6245fbedaedad0f9c

[Mark Seaborn, 2014-02-28 22:46:34]

This is the Clang equivalent of https://codereview.chromium.org/183273009.

[Mark Seaborn, 2014-04-02 00:40:03]

This was committed as:
https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-clang.git;a=c...