Temporarily XFAIL MLIR test that fails the LLVM verifier after 8700f2b

Author: joker-eph

mlir/test/Target/LLVMIR/llvmir.mlir

@@ -1,4 +1,6 @@
 // RUN: mlir-translate -mlir-to-llvmir -split-input-file %s | FileCheck %s
+// This is failing the LLVM verifier after 8700f2bd36bb9b
+// XFAIL: *
 
 // CHECK: @global_aligned32 = private global i64 42, align 32
 "llvm.mlir.global"() ({}) {sym_name = "global_aligned32", type = i64, value = 42 : i64, linkage = #llvm.linkage<private>, alignment = 32} : () -> ()