[clang] CTAD alias: fix the transformation for the require-clause expr (#90961) In the clang AST, constraint nodes are deliberately not instantiated unless they are actively being evaluated. Consequently, occurrences of template parameters in the require-clause expression have a subtle "depth" difference compared to normal occurrences in places, such as function parameters. When transforming the require-clause, we must take this distinction into account. The existing implementation overlooks this consideration. This patch is to rewrite the implementation of the require-clause transformation to address this issue. Fixes #90177
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