[NFC] Change const char* to StringRef (#154179) This API takes a const char* with a default nullptr value and immdiately passes it down to an API taking a StringRef. All of the places this is called from are either using compile time string literals, the default argument, or string objects that have known length. Discarding the length known from a calling API to just have to strlen it to call the next layer down that requires a StringRef is a bit silly, so this change updates CodeGenModule::GetAddrOfConstantCString to use StringRef instead of const char* for the GlobalName parameter. It might be worth also replacing the first parameter with an llvm ADT type that avoids allocation, but that change would have wider impact so we should consider it separately.
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