[CIR] Fix NYI AAPCS bit-fields by skipping unsupported case (#145560)

This PR addresses the error mentioned in
https://github.com/llvm/llvm-project/pull/145067#issuecomment-3001104015,
which occurs on ARM when handling an unsupported bit-field case. The
patch removes the error and replaces it with an assert, marking the
missing feature.

clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp

@@ -781,10 +781,7 @@ void CIRRecordLowering::computeVolatileBitfields() {
       !cirGenTypes.getCGModule().getCodeGenOpts().AAPCSBitfieldWidth)
     return;
 
-  for ([[maybe_unused]] auto &I : bitFields) {
-    assert(!cir::MissingFeatures::armComputeVolatileBitfields());
-    cirGenTypes.getCGModule().errorNYI("NYI AAPCS bit-fields");
-  }
+  assert(!cir::MissingFeatures::armComputeVolatileBitfields());
 }
 
 void CIRRecordLowering::accumulateBases(const CXXRecordDecl *cxxRecordDecl) {