[llvm-mca] Remove redundant include from BackendStatistics.h. NFC

Also use llvm::DenseMap for Histograms (instead of std::map).

llvm-svn: 329074

1 files changed, 2 insertions, 3 deletions

diff --git a/llvm/tools/llvm-mca/BackendStatistics.h b/llvm/tools/llvm-mca/BackendStatistics.h
index eba8f251f2a..c3cec95f8df 100644
--- a/llvm/tools/llvm-mca/BackendStatistics.h
+++ b/llvm/tools/llvm-mca/BackendStatistics.h
@@ -57,19 +57,18 @@
 #ifndef LLVM_TOOLS_LLVM_MCA_BACKENDSTATISTICS_H
 #define LLVM_TOOLS_LLVM_MCA_BACKENDSTATISTICS_H
 
-#include "Backend.h"
 #include "View.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/DenseMap.h"
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Support/raw_ostream.h"
-#include <map>
 
 namespace mca {
 
 class BackendStatistics : public View {
   const llvm::MCSubtargetInfo &STI;
 
-  using Histogram = std::map<unsigned, unsigned>;
+  using Histogram = llvm::DenseMap<unsigned, unsigned>;
   Histogram DispatchGroupSizePerCycle;
   Histogram RetiredPerCycle;
   Histogram IssuedPerCycle;