[Test] Remove c-index-test from the list of substitutions

All the tests are under the clang tests and none should be under llvm moving
forward.

The topic was discussed in this thread:

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

llvm-svn: 208234

llvm/test/lit.cfg

@@ -244,7 +244,6 @@ for pattern in [r"\bbugpoint\b(?!-)",
                 NOJUNK + r"\bopt\b",
                 r"\bFileCheck\b",
                 r"\bFileUpdate\b",
-                r"\bc-index-test\b",
                 r"\bobj2yaml\b",
                 r"\byaml2obj\b",
                 # Handle these specially as they are strings searched