[Test] Remove substitution for clang

clang should not be used in the llvm tests.  The topic was discussed in this
thread:

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140428/214905.html

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207976 91177308-0d34-0410-b5e6-96231b3b80d8
Remove the -disable-cfi option.

This also add a release note about it. If this stays I will cleanup MC
next week.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207977 91177308-0d34-0410-b5e6-96231b3b80d8
LTO: -internalize sets visibility to default

Visibility is meaningless when the linkage is local.  Change
`-internalize` to reset the visibility to `default`.

<rdar://problem/16141113>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207979 91177308-0d34-0410-b5e6-96231b3b80d8