[TableGen] Remove unnecessary include and just forward declare. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238179 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/TableGen/TableGenBackend.h b/include/llvm/TableGen/TableGenBackend.h
index 3e4f3cc917a80b134f67f36044245aef04a30524..d226f1f1af7b406bb3d3b72c760867c54e67410a 100644 (file)
--- a/include/llvm/TableGen/TableGenBackend.h
+++ b/include/llvm/TableGen/TableGenBackend.h
@@ -14,10 +14,9 @@
 #ifndef LLVM_TABLEGEN_TABLEGENBACKEND_H
 #define LLVM_TABLEGEN_TABLEGENBACKEND_H
 
-#include "llvm/ADT/StringRef.h"
-
 namespace llvm {
 
+class StringRef;
 class raw_ostream;
 
 /// emitSourceFileHeader - Output an LLVM style file header to the specified