Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Linker/unique-fwd-decl-order.ll

@@ -0,0 +1,20 @@
+; RUN: llvm-link %s %S/Inputs/unique-fwd-decl-order.ll -S -o - | FileCheck %s
+; RUN: llvm-link %S/Inputs/unique-fwd-decl-order.ll %s -S -o - | FileCheck %s
+
+; This test exercises MDNode hashing.  For the nodes to be correctly uniqued,
+; the hash of a to-be-created MDNode has to match the hash of an
+; operand-just-changed MDNode (with the same operands).
+;
+; Note that these two assembly files number the nodes identically, even though
+; the nodes are in a different order.  This is for the reader's convenience.
+
+; CHECK: !named = !{!0, !0}
+!named = !{!0}
+
+; CHECK: !0 = !{!1}
+!0 = !{!1}
+
+; CHECK: !1 = !{}
+!1 = !{}
+
+; CHECK-NOT: !2