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

[Andy Kaylor via cfe-commits]

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@@ -65,6 +65,10 @@ struct CIROpAsmDialectInterface : public OpAsmDialectInterface {
       os << (boolAttr.getValue() ? "true" : "false");
       return AliasResult::FinalAlias;
     }
+    if (auto bitfield = mlir::dyn_cast<cir::BitfieldInfoAttr>(attr)) {
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andykaylor wrote:

Can you add an IR test to make sure this gets parsed correctly?

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