[clang] [flang] [mlir] [Flang][Driver] Added support for -funique-internal-linkage-names option (PR #216680)

[Tarun Prabhu via cfe-commits]

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tarunprabhu wrote:

Could you clarify what this test is checking for? It seems very similar to `sample-profile-suffix-elision-policy.mlir`

https://github.com/llvm/llvm-project/pull/216680