[HIP][AMDGPU] Assertion failure when AMD attribute value depends on template argument

[jayfoad]

With this test case I get:

$ clang++ -nogpuinc -nogpulib -c -x hip f.txt
clang-21: lib/AST/ExprConstant.cpp:17150: APSInt clang::Expr::EvaluateKnownConstInt(const ASTContext &, SmallVectorImpl<PartialDiagnosticAt> *) const: Assertion `!isValueDependent() && "Expression evaluator can't be called on a dependent expression."' failed.

[jayfoad]

This doesn't just affect amdgpu_max_num_work_groups. There are other attributes that AMDGPUTargetCodeGenInfo handles by calling EvaluateKnownConstInt, which probably have the same problem.

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Jay Foad (jayfoad)

With this [test case](https://github.com/user-attachments/files/20164855/f.txt) I get: ``` $ clang++ -nogpuinc -nogpulib -c -x hip f.txt clang-21: lib/AST/ExprConstant.cpp:17150: APSInt clang::Expr::EvaluateKnownConstInt(const ASTContext &, SmallVectorImpl<PartialDiagnosticAt> *) const: Assertion `!isValueDependent() && "Expression evaluator can't be called on a dependent expression."' failed. ```

[shiltian]

Yup, we need to skip dependent expression.