[clang] Don't assert on paren-less lambdas with dependent return type (#176296) The initial implementation of C++23 style lambdas without parameter lists, 0620e6f4b76a9, removed `DeclLoc`, which was used to intitialize `DeclEndLoc`. This code was then moved around a bit in behavior-preserving ways in https://reviews.llvm.org/D124351 and 2eb1e75f42d7e09e. If a lambda has no parentheses, no exception-specification, attribute-specifier, *and* a decltype() return type (which leads to `ParseTrailingReturnType` returning a range where `Range.getEnd().isValid()` is false), then we no longer set a valid `DeclEndLoc`. Fix this by restoring `DeclLoc` and using it as it was used before 0620e6f4b76a9. Fixes #176256.
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