[llvm-profgen] Error out for unsupported AutoFDO profile generate with probe

Error out instead of siliently generate empty profile when trying to generate AutoFDO profile with probe binary.

Differential Revision: https://reviews.llvm.org/D116508

llvm/tools/llvm-profgen/ProfileGenerator.cpp

@@ -383,6 +383,8 @@ ProfileGenerator::getTopLevelFunctionProfile(StringRef FuncName) {
 void ProfileGenerator::generateProfile() {
   if (Binary->usePseudoProbes()) {
     // TODO: Support probe based profile generation
+    exitWithError("Probe based profile generation not supported for AutoFDO, "
+      "consider dropping `--ignore-stack-samples` or adding `--use-dwarf-correlation`.");
   } else {
     generateLineNumBasedProfile();
   }