[TableGen] Use the SMLoc header file instead of SourceMgr header file in a couple places. NFC

llvm-svn: 239274
diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index 90ccee3..8f01abd 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -14,9 +14,10 @@
 #ifndef LLVM_UTILS_TABLEGEN_CODEGENINSTRUCTION_H
 #define LLVM_UTILS_TABLEGEN_CODEGENINSTRUCTION_H
 
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/CodeGen/MachineValueType.h"
-#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/SMLoc.h"
 #include <string>
 #include <utility>
 #include <vector>