
This patch makes the assertion (that is currently in a comment) that validates that names mangled by clang can be demangled by LLVM actually compile/work. There were some minor issues that needed to be fixed (like starts_with not being available on std::string and needing to call getDecl() on GD), and a logic issue that should be fixed in this patch. This enables just uncommenting the assertion to enable it within the compiler (minus needing to add the header file).
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