[clang] Don't use `VarDecl` of local variables as `ManglingContextDecl` for lambdas (#179035) Currently, in a C++20 modules context, a `VarDecl` of a local variable can wrongly end up as a `ManglingContextDecl` for a lambda. Fix this by removing `ContextKind::NonInlineInModulePurview` in `Sema::getCurrentMangleNumberContext` and add `IsExternallyVisibleInModulePurview` checks in the appropriate places: - For externally visible functions defined in a module purview, add a check to `isInInlineFunction`, renaming it to `IsInFunctionThatRequiresMangling` - For externally visible variables defined in a module purview, add a new `ContextKind::ExternallyVisibleVariableInModulePurview` and an appropriate check to the `VarDecl` case Fixes #178893 --------- Co-authored-by: Corentin Jabot <corentinjabot@gmail.com> Co-authored-by: Chuanqi Xu <yedeng.yd@linux.alibaba.com>
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