add definition for LongjmpOp

Author: toyoyou11

clang/include/clang/CIR/Dialect/IR/CIROps.td

@@ -4755,6 +4755,24 @@ def CIR_EhSetjmpOp : CIR_Op<"eh.setjmp"> {
   }];
 }
 
+def CIR_EhLongjmpOp : CIR_Op<"eh.longjmp"> {
+  let summary = "CIR longjmp operation";
+  let description = [{
+    Restore the environment (e.g., stack pointer, instruction pointer, signal mask, and other registers)
+    at the time of setjmp() call, by using the information saved in `env` by setjmp().
+
+    Examples:
+    ```mlir
+      cir.eh.longjmp %arg0 : (!cir.ptr<!cir.void>) -> ()
+    ```
+  }];
+  let arguments = (ins CIR_PointerType:$env);
+
+  let assemblyFormat = [{
+      $env `:` functional-type($env, results) attr-dict
+  }];
+}
+
 //===----------------------------------------------------------------------===//
 // CopyOp
 //===----------------------------------------------------------------------===//