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-llvm.git;a=commit;h=b768b984a38ef3d097b1db720872326b7d82a4d7

[Mark Seaborn, 2014-02-28 22:37:42]

Obviously I'll push the commits in one go, and won't push this change on its
own. :-)

I'll leave it up to you how much you inspect this change.

[Mark Seaborn, 2014-04-02 00:37:52]

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