Fix `ptr_to_bit_field.field`

src/llvm_backend_expr.cpp

@@ -4726,9 +4726,12 @@ gb_internal lbAddr lb_build_addr_internal(lbProcedure *p, Ast *expr) {
 				if (sub_sel.index.count > 0) {
 					ptr = lb_emit_deep_field_gep(p, ptr, sub_sel);
 				}
+				if (is_type_pointer(type_deref(ptr.type))) {
+					ptr = lb_emit_load(p, ptr);
+				}
 
 				Type *bf_type = type_deref(ptr.type);
-				bf_type = base_type(type_deref(bf_type));
+				bf_type = base_type(bf_type);
 				GB_ASSERT(bf_type->kind == Type_BitField);
 
 				i32 index = sel.index[sel.index.count-1];

src/llvm_backend_general.cpp

@@ -453,7 +453,7 @@ gb_internal lbAddr lb_addr_swizzle_large(lbValue addr, Type *array_type, Slice<i
 gb_internal lbAddr lb_addr_bit_field(lbValue addr, Type *type, i64 index, i64 bit_offset, i64 bit_size) {
 	GB_ASSERT(is_type_pointer(addr.type));
 	Type *mt = type_deref(addr.type);
-	GB_ASSERT(is_type_bit_field(mt));
+	GB_ASSERT_MSG(is_type_bit_field(mt), "%s", type_to_string(mt));
 
 	lbAddr v = {lbAddr_BitField, addr};
 	v.bitfield.type       = type;