[llvm] [AMDGPU] Add AMDGPU specific variadic operation MCExprs (PR #82022)

[Matt Arsenault via llvm-commits]

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+// RUN: not llvm-mc -triple amdgcn-amd-amdhsa %s 2>&1 | FileCheck --check-prefix=ASM %s
+
+// ASM: error: empty max/or expression
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arsenm wrote:

Check line numbers? 

https://github.com/llvm/llvm-project/pull/82022