Apply clang-tidy's misc-move-constructor-init throughout LLVM.

No functionality change intended, maybe a tiny performance improvement.

llvm-svn: 270997
diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index 8e371af..8e5a03d 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -316,7 +316,8 @@
         K_Reg
       } Kind;
 
-      ResultOperand(std::string N, Record *r) : Name(N), R(r), Kind(K_Record) {}
+      ResultOperand(std::string N, Record *r)
+          : Name(std::move(N)), R(r), Kind(K_Record) {}
       ResultOperand(int64_t I) : Imm(I), Kind(K_Imm) {}
       ResultOperand(Record *r) : R(r), Kind(K_Reg) {}