[clang] [CIR] Refactor global variable emission and initialization (PR #138222)

[Amr Hesham via cfe-commits]

================
@@ -46,6 +55,14 @@ class ConstantEmitter {
   ConstantEmitter(const ConstantEmitter &other) = delete;
   ConstantEmitter &operator=(const ConstantEmitter &other) = delete;
 
+  ~ConstantEmitter();
+
+  /// Try to emit the initiaizer of the given declaration as an abstract
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AmrDeveloper wrote:

nit

```suggestion
  /// Try to emit the initializer of the given declaration as an abstract
```


https://github.com/llvm/llvm-project/pull/138222