[clang] [CIR] Upstream support for break and continue statements (PR #134181)

[Erich Keane via cfe-commits]

================
@@ -569,6 +569,35 @@ def YieldOp : CIR_Op<"yield", [ReturnLike, Terminator,
   ];
 }
 
+//===----------------------------------------------------------------------===//
+// BreakOp
+//===----------------------------------------------------------------------===//
+
+def BreakOp : CIR_Op<"break", [Terminator]> {
+  let summary = "C/C++ `break` statement equivalent";
+  let description = [{
+    The `cir.break` operation is used to cease the control flow to the parent
+    operation, exiting its region's control flow. It is only allowed if it is
+    within a breakable operation (loops and `switch`).
+  }];
+  let assemblyFormat = "attr-dict";
+  let hasVerifier = 1;
+}
+
+//===----------------------------------------------------------------------===//
+// ContinueOp
+//===----------------------------------------------------------------------===//
+
+def ContinueOp : CIR_Op<"continue", [Terminator]> {
+  let summary = "C/C++ `continue` statement equivalent";
+  let description = [{
+    The `cir.continue` operation is used to continue execution to the next
----------------
erichkeane wrote:

```suggestion
    The `cir.continue` operation is used end execution of the current iteration of the loop, and resume execution of the next
```

Or something like that.  

https://github.com/llvm/llvm-project/pull/134181