[ARM] Make empty name symbols SF_FormatSpecific to try appeasing --ta…

…rget=armv7-linux-androideabi24 sanitizer symbolization tests

This is similar to D98669 but I don't know whether and why ARM needs it.

I suspect this may fix the sanitizer-x86_64-linux-android bot which runs
--target=armv7-linux-androideabi24 tests
(https://lab.llvm.org/buildbot/#/builders/77)

Someone needs to investigate the root cause and I am not sure this hack
fixes the bot.

llvm/include/llvm/Object/ELFObjectFile.h

@@ -733,7 +733,8 @@ Expected<uint32_t> ELFObjectFile<ELFT>::getSymbolFlags(DataRefImpl Sym) const {
   } else if (EF.getHeader().e_machine == ELF::EM_ARM) {
     if (Expected<StringRef> NameOrErr = getSymbolName(Sym)) {
       StringRef Name = *NameOrErr;
-      if (Name.startswith("$d") || Name.startswith("$t") ||
+      // TODO Investigate why empty name symbols need to be marked.
+      if (Name.empty() || Name.startswith("$d") || Name.startswith("$t") ||
           Name.startswith("$a"))
         Result |= SymbolRef::SF_FormatSpecific;
     } else {