[asan] Use more generic string in error message

[vitalybuka]

Summary

Part of https://github.com/google/sanitizers/issues/637

[kcc]

LGTM

compiler-rt/trunk/lib/asan/asan_posix.cc

 
 namespace __asan {
 
 void AsanOnDeadlySignal(int signo, void *siginfo, void *context) {
   ScopedDeadlySignal signal_scope(GetCurrentThread());
   int code = (int)((siginfo_t*)siginfo)->si_code;
   // Write the first message using fd=2, just in case.
   // It may actually fail to write in case stderr is closed.
-  internal_write(2, "ASAN:DEADLYSIGNAL\n", 18);
+  internal_write(2, SanitizerToolName, internal_strlen(SanitizerToolName));
+  static const char kDeadlySignal[] = ":DEADLYSIGNAL\n";
+  internal_write(2, kDeadlySignal, sizeof(kDeadlySignal) - 1);
   SignalContext sig = SignalContext::Create(siginfo, context);
 
   // Access at a reasonable offset above SP, or slightly below it (to account
   // for x86_64 or PowerPC redzone, ARM push of multiple registers, etc) is
   // probably a stack overflow.
 #ifdef __s390__
   // On s390, the fault address in siginfo points to start of the page, not
   // to the precise word that was accessed.  Mask off the low bits of sp to

compiler-rt/trunk/test/asan/TestCases/Posix/allow_user_segv.cc

int main() {
   // 32-bit Darwin triggers SIGBUS instead.
   if (InstallHandler(SIGSEGV, &original_sigaction_sigsegv) &&
       InstallHandler(SIGBUS, &original_sigaction_sigbus)) {
     fprintf(stderr, "User sigaction installed\n");
   }
   return DoSEGV();
 }
 
-// CHECK0-NOT: ASAN:DEADLYSIGNAL
+// CHECK0-NOT: AddressSanitizer:DEADLYSIGNAL
 // CHECK0-NOT: AddressSanitizer: SEGV on unknown address
 // CHECK0: User sigaction installed
 // CHECK0-NEXT: User sigaction called
 
 // CHECK1: User sigaction installed
 // CHECK1-NEXT: User sigaction called
-// CHECK1-NEXT: ASAN:DEADLYSIGNAL
+// CHECK1-NEXT: AddressSanitizer:DEADLYSIGNAL
 // CHECK1: AddressSanitizer: SEGV on unknown address
 
 // CHECK2-NOT: User sigaction called
 // CHECK2: User sigaction installed
-// CHECK2-NEXT: ASAN:DEADLYSIGNAL
+// CHECK2-NEXT: AddressSanitizer:DEADLYSIGNAL
 // CHECK2: AddressSanitizer: SEGV on unknown address