[asan] Avoid global ~DenseMap()

Follow up to #100923

Author: vitalybuka

compiler-rt/lib/asan/asan_globals.cpp

@@ -37,11 +37,9 @@ struct GlobalListNode {
   GlobalListNode *next = nullptr;
 };
 typedef IntrusiveList<GlobalListNode> ListOfGlobals;
-typedef DenseMap<uptr, ListOfGlobals> MapOfGlobals;
 
 static Mutex mu_for_globals;
 static ListOfGlobals list_of_all_globals;
-static MapOfGlobals map_of_globals_by_indicator;
 
 static const int kDynamicInitGlobalsInitialCapacity = 512;
 struct DynInitGlobal {
@@ -60,6 +58,19 @@ struct GlobalRegistrationSite {
 typedef InternalMmapVector<GlobalRegistrationSite> GlobalRegistrationSiteVector;
 static GlobalRegistrationSiteVector *global_registration_site_vector;
 
+static ListOfGlobals &GlobalsByIndicator(uptr odr_indicator) {
+  using MapOfGlobals = DenseMap<uptr, ListOfGlobals>;
+
+  static MapOfGlobals *globals_by_indicator = nullptr;
+  if (!globals_by_indicator) {
+    alignas(
+        alignof(MapOfGlobals)) static char placeholder[sizeof(MapOfGlobals)];
+    globals_by_indicator = new (placeholder) MapOfGlobals();
+  }
+
+  return (*globals_by_indicator)[odr_indicator];
+}
+
 ALWAYS_INLINE void PoisonShadowForGlobal(const Global *g, u8 value) {
   FastPoisonShadow(g->beg, g->size_with_redzone, value);
 }
@@ -152,8 +163,7 @@ static void CheckODRViolationViaIndicator(const Global *g) {
   if (g->odr_indicator == UINTPTR_MAX)
     return;
 
-  ListOfGlobals &relevant_globals =
-      map_of_globals_by_indicator[g->odr_indicator];
+  ListOfGlobals &relevant_globals = GlobalsByIndicator(g->odr_indicator);
 
   u8 *odr_indicator = reinterpret_cast<u8 *>(g->odr_indicator);
   if (*odr_indicator == REGISTERED) {