llvm-project

ebf0ae19 - [clang] implement CWG2064: ignore value dependence for decltype

[clang] implement CWG2064: ignore value dependence for decltype The 'decltype' for a value-dependent (but non-type-dependent) should be known, so this patch makes them non-opaque instead. This patch also implements what's neceessary to allow overloading on pure differences in instantiation dependence, making `std::void_t` usable for SFINAE purposes. This also readds a few test cases from da98651, which was a previous attempt at resolving CWG2064. Fixes #8740 Fixes #61818 Fixes #190388