TrigramIndex.h - move unnecessary StringRef include down to TrigramIndex.cpp

llvm/include/llvm/Support/TrigramIndex.h

@@ -27,12 +27,12 @@
 #define LLVM_SUPPORT_TRIGRAMINDEX_H
 
 #include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringRef.h"
 #include <string>
 #include <unordered_map>
 #include <vector>
 
 namespace llvm {
+class StringRef;
 
 class TrigramIndex {
  public:

llvm/lib/Support/TrigramIndex.cpp

@@ -15,6 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/TrigramIndex.h"
+#include "llvm/ADT/StringRef.h"
 #include <set>
 
 using namespace llvm;