[clang] Make CIR assembly formats strict properties compatible (PR #226600)

[Henrich Lauko via cfe-commits]

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@@ -3959,6 +3971,7 @@ def CIR_GetBitfieldOp : CIR_Op<"get_bitfield"> {
 
   let assemblyFormat = [{
     (`align` `(` $alignment^ `)`)?
+    (`volatile` $is_volatile^)?
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xlauko wrote:

```suggestion
    ` `  (`volatile` $is_volatile^)?
```

https://github.com/llvm/llvm-project/pull/226600