[compiler-rt] [rtsan] Remove std::variant from rtsan diagnostics (PR #109786)

[via llvm-commits]

================
@@ -53,35 +47,39 @@ static void PrintStackTrace(uptr pc, uptr bp) {
 }
 
 static void PrintError(const Decorator &decorator,
-                       const DiagnosticsCallerInfo &info) {
-  const char *violation_type = std::visit(
-      Overloaded{
-          [](const InterceptedCallInfo &) { return "unsafe-library-call"; },
-          [](const BlockingCallInfo &) { return "blocking-call"; }},
-      info);
+                       const DiagnosticsInfo &info) {
+  const auto error_type_str = [&info]() -> const char * {
+    switch (info.type) {
+    case DiagnosticsInfoType::InterceptedCall:
+      return "unsafe-library-call";
+    case DiagnosticsInfoType::BlockingCall:
+      return "blocking-call";
+    }
+    return "(unknown error)";
+  };
 
   Printf("%s", decorator.Error());
-  Report("ERROR: RealtimeSanitizer: %s\n", violation_type);
+  Report("ERROR: RealtimeSanitizer: %s\n", error_type_str());
 }
 
 static void PrintReason(const Decorator &decorator,
-                        const DiagnosticsCallerInfo &info) {
+                        const DiagnosticsInfo &info) {
   Printf("%s", decorator.Reason());
 
-  std::visit(
-      Overloaded{[decorator](const InterceptedCallInfo &call) {
-                   Printf("Intercepted call to real-time unsafe function "
-                          "`%s%s%s` in real-time context!",
-                          decorator.FunctionName(),
-                          call.intercepted_function_name_, decorator.Reason());
-                 },
-                 [decorator](const BlockingCallInfo &arg) {
-                   Printf("Call to blocking function "
-                          "`%s%s%s` in real-time context!",
-                          decorator.FunctionName(), arg.blocking_function_name_,
-                          decorator.Reason());
-                 }},
-      info);
+  switch (info.type) {
+  case DiagnosticsInfoType::InterceptedCall: {
+    Printf("Intercepted call to real-time unsafe function "
+           "`%s%s%s` in real-time context!",
+           decorator.FunctionName(), info.func_name, decorator.Reason());
+    break;
+  }
+  case DiagnosticsInfoType::BlockingCall: {
+    Printf("Call to blocking function "
+           "`%s%s%s` in real-time context!",
+           decorator.FunctionName(), info.func_name, decorator.Reason());
+    break;
+  }
+  }
----------------
davidtrevelyan wrote:

Yup, this is `clang-format`'s `IndentCaseLabels` option at work - I've seen it as `false` more often than not on the codebases I've worked on, but I get it's a bit odd if you're used to indented `case`s

https://github.com/llvm/llvm-project/pull/109786