Since the file has both ppc and ppc64 tests in it rename it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@221285 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/ppc64-varargs-struct.c b/test/CodeGen/ppc-varargs-struct.c
similarity index 100%
rename from test/CodeGen/ppc64-varargs-struct.c
rename to test/CodeGen/ppc-varargs-struct.c