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

[Erich Keane via cfe-commits]

================
@@ -375,4 +375,67 @@ def CIR_VisibilityAttr : CIR_EnumAttr<CIR_VisibilityKind, "visibility"> {
   }];
 }
 
+//===----------------------------------------------------------------------===//
+// BitfieldInfoAttr
+//===----------------------------------------------------------------------===//
+
+def BitfieldInfoAttr : CIR_Attr<"BitfieldInfo", "bitfield_info"> {
+  let summary = "Represents a bit field info";
----------------
erichkeane wrote:

```suggestion
  let summary = "Represents info for a bit-field member";
```

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