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

[via cfe-commits]

================
@@ -326,13 +326,47 @@ mlir::Value 
CIRGenFunction::emitStoreThroughBitfieldLValue(RValue src,
   return {};
 }
 
+Address CIRGenFunction::getAddrOfBitFieldStorage(LValue base,
+                                                 const FieldDecl *field,
+                                                 mlir::Type fieldType,
+                                                 unsigned index) {
+  if (index == 0)
+    return base.getAddress();
----------------
Andres-Salamanca wrote:

I made the change. In the tests, I used s->c, which is packed inside the first 
struct member.

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