Fallback in libsanitizer for scudo sanitizer (PR sanitizer/87892).

2018-11-09  Martin Liska  <mliska@suse.cz>

	PR sanitizer/87892
	* sanitizer_common/sanitizer_linux_libcdep.cc (defined): Return
	1 when CPU_COUNT macro is not defined.

From-SVN: r265950

libsanitizer/ChangeLog

+2018-11-09  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/87892
+	* sanitizer_common/sanitizer_linux_libcdep.cc (defined): Return
+	1 when CPU_COUNT macro is not defined.
+
 2018-11-08  Bill Seurer  <seurer@linux.vnet.ibm.com>
 
 	* libsanitizer/sanitizer_common/sanitizer_linux.cc (CheckASLR):

libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc

@@ -694,9 +694,13 @@ u32 GetNumberOfCPUs() {
 #elif SANITIZER_SOLARIS
   return sysconf(_SC_NPROCESSORS_ONLN);
 #else
+#if defined(CPU_COUNT)
   cpu_set_t CPUs;
   CHECK_EQ(sched_getaffinity(0, sizeof(cpu_set_t), &CPUs), 0);
   return CPU_COUNT(&CPUs);
+#else
+  return 1;
+#endif
 #endif
 }