[AllocToken] Fix attribute mismatch in AllocTokenPass (#174959) Fixes an attribute mismatch error in `AllocTokenPass` that occurs during ThinLTO builds at OptimizationLevel::O0. The `getTokenAllocFunction` in `AllocTokenPass` was incorrectly copying attributes from the instrumented function (`Callee`) to an *existing* `void()` alloc-token function retrieved by `Mod.getOrInsertFunction`. This resulted in arg attributes being added to a function with no parameters, causing `VerifyPass` to fail with "Attribute after last parameter!". The fix modifies `getTokenAllocFunction` to pass the `Callee`'s attributes directly to the `Mod.getOrInsertFunction` overload. This ensures attributes are only applied when the alloc-token function is *newly inserted*, preventing unintended attribute modifications on already existing function declarations. See https://g-issues.chromium.org/issues/474289092 for detailed reproduction steps and analysis. Co-authored-by: Ayumi Ono <ayumiohno@google.com>
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