[clang] [CIR] Upstream support for switch statements case kinds (PR #138003)

[Andy Kaylor via cfe-commits]

================
@@ -91,12 +92,40 @@ void sw2(int a) {
 // OGCG: [[SW_EPILOG]]:
 // OGCG:   ret void
 
+void sw3(int a) {
----------------
andykaylor wrote:

Please add tests for the GNU range case, including one where it would be in the same group with other cases, like this:

```
void f(int x) {
  switch (x) {
    case 1:
    case 2:
    case 3 ... 6:
    case 7:
      break;
    default:
      break;
  }
}
```

https://github.com/llvm/llvm-project/pull/138003