Rename dg.exp to llvmc.exp. This is so I can ignore it during a make check if I want to.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64103 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/LLVMC/dg.exp b/test/LLVMC/llvmc.exp
similarity index 100%
rename from test/LLVMC/dg.exp
rename to test/LLVMC/llvmc.exp