[clang] [CIR] Upstream TryCallOp (PR #165303)

[Andy Kaylor via cfe-commits]

================
@@ -2855,6 +2855,95 @@ def CIR_CallOp : CIR_CallOpBase<"call", [NoRegionArguments]> {
   ];
 }
 
+def CIR_TryCallOp : CIR_CallOpBase<"try_call",[
+  Terminator
+]> {
+  let summary = "try_call operation";
+  let description = [{
+    Mostly similar to `cir.call` but requires two destination
+    branches, one for follow on regular control-flow, and the other
+    one for handling exceptions in case it's thrown.
----------------
andykaylor wrote:

```suggestion
    blocks, one which is used if the call returns without throwing an
    exception (the "normal" destination) and another which is used
    if an exception is thrown (the "unwind" destination).
```

https://github.com/llvm/llvm-project/pull/165303