[compiler-rt] [rtsan] Only print out unique stack traces (PR #110028)

[Florian Mayer via llvm-commits]

================
@@ -49,7 +50,21 @@ static auto OnViolationAction(DiagnosticsInfo info) {
   return [info]() {
     IncrementTotalErrorCount();
 
-    PrintDiagnostics(info);
+    BufferedStackTrace stack;
+    stack.Unwind(info.pc, info.bp, nullptr,
+                 /*request_fast*/ true);
+
+    StackDepotHandle handle = StackDepotPut_WithHandle(stack);
----------------
fmayer wrote:

Theoretically, if we run another sanitizer and RTSan at the same time (can you do that?) this will be wrong. Do we need a separate instance of StackDepot for this? Or do we need to keep count separately?

https://github.com/llvm/llvm-project/pull/110028