[llvm] [TableGen] Add let append/prepend syntax for field concatenation (PR #182382)

[Rahul Joshi via llvm-commits]

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@@ -0,0 +1,13 @@
+// RUN: not llvm-tblgen %s 2>&1 | FileCheck %s
+// XFAIL: vg_leak
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jurahul wrote:

nit: is this really needed? or just copy-paste?

https://github.com/llvm/llvm-project/pull/182382