Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/TableGen/LoLoL.td

@@ -0,0 +1,18 @@
+// RUN: llvm-tblgen %s | FileCheck %s
+// XFAIL: vg_leak
+
+class Base<list<int> v> {
+  list<int> values = v;
+}
+
+class Derived<list<int> v> : Base<!if(!empty(v),[0],v)>;
+
+multiclass Multi<list<list<list<int>>> v> {
+  def ONE : Derived<!if(!empty(v),[]<int>,!if(!empty(!head(v)),[]<int>,v[0][0]))>;
+  def TWO : Derived<!if(!empty(v),[]<int>,!if(!empty(!tail(v)),!if(!empty(!head(v)),[]<int>,v[0][0]),v[1][0]))>;
+}
+
+defm Def : Multi<[[[]],[[1, 2, 3]]]>;
+
+// CHECK: values = [0]
+// CHECK: values = [1, 2, 3]