[HWASan] Initalize shadow earler.

[alekseyshl]

Summary

Initialize shadow memory before calling more libc functions to allow
for HWASan-instrumented libc.

lib/hwasan/hwasan.cc

void __hwasan_init() {
   CacheBinaryName();
   InitializeFlags();
 
   // Install tool-specific callbacks in sanitizer_common.
   SetCheckFailedCallback(HWAsanCheckFailed);
 
   __sanitizer_set_report_path(common_flags()->log_path);
 
-  InitializeInterceptors();
-  InstallDeadlySignalHandlers(HwasanOnDeadlySignal);
-  InstallAtExitHandler(); // Needs __cxa_atexit interceptor.
-
   DisableCoreDumperIfNecessary();
   if (!InitShadow()) {
     Printf("FATAL: HWAddressSanitizer cannot mmap the shadow memory.\n");
     if (HWASAN_FIXED_MAPPING) {
       Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
       Printf("FATAL: Disabling ASLR is known to cause this error.\n");
       Printf("FATAL: If running under GDB, try "
              "'set disable-randomization off'.\n");
     }
     DumpProcessMap();
     Die();
   }
 
+  InitializeInterceptors();
+  InstallDeadlySignalHandlers(HwasanOnDeadlySignal);
+  InstallAtExitHandler(); // Needs __cxa_atexit interceptor.
+
   Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer);
 
   InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
 
   HwasanTSDInit(HwasanTSDDtor);
 
   HwasanAllocatorInit();