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

[Chris Apple via llvm-commits]

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@@ -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);
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cjappl wrote:

It is unclear to me the pros/cons of requesting fast stack unwinding is, let me know if this is wrong.

My only gut feeling is "fast is good", but that's where my knowledge stops

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