[clang] [flang] [mlir] [flang] Retry add basic -mtune support (PR #96688)

[Tobias Gysi via cfe-commits]

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@@ -0,0 +1,7 @@
+// RUN: mlir-translate -mlir-to-llvmir %s | FileCheck %s
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gysit wrote:

This may require x86-registered-target as well?

https://github.com/llvm/llvm-project/pull/96688