Restore test files accidentally deleted in r354839

I think there must be a bug in git-llvm causing parent directories to be
deleted when the diff deletes files in a subdirectory. Perhaps it is
Windows-only.

There has been a behavior change, so some of these tests now fail. I
have marked them XFAIL and will fix them in a follow-up to separate the
changes.

llvm-svn: 360699
diff --git a/clang/test/ASTMerge/enum/Inputs/enum2.c b/clang/test/ASTMerge/enum/Inputs/enum2.c
new file mode 100644
index 0000000..315b4dc
--- /dev/null
+++ b/clang/test/ASTMerge/enum/Inputs/enum2.c
@@ -0,0 +1,42 @@
+// Matching
+enum E1 {
+  E1Enumerator1,
+  E1Enumerator2 = 3,
+  E1Enumerator3
+} x1;
+
+// Value mismatch
+enum E2 {
+  E2Enumerator1,
+  E2Enumerator2 = 4,
+  E2Enumerator3
+} x2;
+
+// Name mismatch
+enum E3 {
+  E3Enumerator1,
+  E3Enumerator = 3,
+  E3Enumerator3
+} x3;
+
+// Missing enumerator
+enum E4 {
+  E4Enumerator1,
+  E4Enumerator2
+} x4;
+
+// Extra enumerator
+enum E5 {
+  E5Enumerator1,
+  E5Enumerator2,
+  E5Enumerator3,
+  E5Enumerator4
+} x5;
+
+// Matching, with typedef
+typedef enum {
+  E6Enumerator1,
+  E6Enumerator2
+} E6;
+
+E6 x6;