[sanitizer] Don't define common ReportDeadlySignal on Fuchsia

[phosek]

Summary

This causes a linker error because of duplicate symbol since
ReportDeadlySignal is defined both in sanitizer_common_libcdep and
sanitizer_fuchsia.

[phosek]

Ping

[vitalybuka]

Is any build bot for asan on fuchsia?

[phosek]

In D37952#874731, @vitalybuka wrote:

Is any build bot for asan on fuchsia?

Not yet, but I'm working on it.

lib/sanitizer_common/sanitizer_common_libcdep.cc

if (heap_profile &&
       Printf("\n\nHEAP PROFILE at RSS %zdMb\n", current_rss_mb);
       __sanitizer_print_memory_profile(90, 20);
       rss_during_last_reported_profile = current_rss_mb;
     }
   }
 }
 #endif
 
-#if !SANITIZER_GO
+#if !SANITIZER_FUCHSIA && !SANITIZER_GO
 void StartReportDeadlySignal() {
   // Write the first message using fd=2, just in case.
   // It may actually fail to write in case stderr is closed.
   CatastrophicErrorWrite(SanitizerToolName, internal_strlen(SanitizerToolName));
   static const char kDeadlySignal[] = ":DEADLYSIGNAL\n";
   CatastrophicErrorWrite(kDeadlySignal, sizeof(kDeadlySignal) - 1);
 }
 

 void ReportDeadlySignal(const SignalContext &sig, u32 tid,
                         UnwindSignalStackCallbackType unwind,
                         const void *unwind_context) {
   if (sig.IsStackOverflow())
     ReportStackOverflowImpl(sig, tid, unwind, unwind_context);
   else
     ReportDeadlySignalImpl(sig, tid, unwind, unwind_context);
 }
-#endif  // !SANITIZER_GO
+#endif  // !SANITIZER_FUCHSIA && !SANITIZER_GO
 
 void WriteToSyslog(const char *msg) {
   InternalScopedString msg_copy(kErrorMessageBufferSize);
   msg_copy.append("%s", msg);
   char *p = msg_copy.data();
   char *q;
 
   // Print one line at a time.