[clang] [CIR] Integral types; simple global variables (PR #118743)

[Aaron Ballman via cfe-commits]

================
@@ -85,14 +115,15 @@ class CIR_Op<string mnemonic, list<Trait> traits = []> :
 def FuncOp : CIR_Op<"func"> {
   let summary = "Declare or define a function";
   let description = [{
-    ... lots of text to be added later ...
+    THe `cir.func` operation defines a function, similar to the `mlir::FuncOp`
----------------
AaronBallman wrote:

```suggestion
    The `cir.func` operation defines a function, similar to the `mlir::FuncOp`
```

https://github.com/llvm/llvm-project/pull/118743