[clang] [CIR] Add GlobalOp ctor and dtor regions (PR #160779)

[Henrich Lauko via cfe-commits]

================
@@ -0,0 +1,48 @@
+// RUN: cir-opt %s -o - | FileCheck %s
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xlauko wrote:

```suggestion
// RUN: cir-opt --verify-roundtrip %s -o - | FileCheck %s
```

https://github.com/llvm/llvm-project/pull/160779