[llvm-exegesis] Add a snippet generator to generate snippets to compute ROB sizes.

llvm-svn: 346394
diff --git a/llvm/tools/llvm-exegesis/lib/BenchmarkResult.h b/llvm/tools/llvm-exegesis/lib/BenchmarkResult.h
index 773a2e5..6df57d2 100644
--- a/llvm/tools/llvm-exegesis/lib/BenchmarkResult.h
+++ b/llvm/tools/llvm-exegesis/lib/BenchmarkResult.h
@@ -58,7 +58,7 @@
 // The result of an instruction benchmark.
 struct InstructionBenchmark {
   InstructionBenchmarkKey Key;
-  enum ModeE { Unknown, Latency, Uops };
+  enum ModeE { Unknown, Latency, Uops, ROBSize };
   ModeE Mode;
   std::string CpuName;
   std::string LLVMTriple;