[clang] [CIR] Upstream get_bitfield operation to load bit-field members from structs (PR #145971)

[Erich Keane via cfe-commits]

================
@@ -1669,6 +1669,85 @@ def GetGlobalOp : CIR_Op<"get_global",
   }];
 }
 
+//===----------------------------------------------------------------------===//
+// GetBitfieldOp
+//===----------------------------------------------------------------------===//
+
+def GetBitfieldOp : CIR_Op<"get_bitfield"> {
+  let summary = "Get a bitfield";
----------------
erichkeane wrote:

```suggestion
  let summary = "Get the information for a bitfield member";
```

https://github.com/llvm/llvm-project/pull/145971