Make Bigint instances immutable by removing all setters.

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
===================================================================
--- runtime/vm/flow_graph_builder.cc	(revision 43482)
+++ runtime/vm/flow_graph_builder.cc	(working copy)
@@ -3318,23 +3318,6 @@
         load->set_recognized_kind(kind);
         return ReturnDefinition(load);
       }
-      case MethodRecognizer::kBigint_setDigits: {
-        Value* receiver = Bind(BuildLoadThisVar(node->scope()));
-        LocalVariable* value_var =
-            node->scope()->LookupVariable(Symbols::Value(), true);
-        ASSERT(value_var != NULL);
-        Value* value = Bind(new(I) LoadLocalInstr(*value_var));
-        StoreInstanceFieldInstr* store = new(I) StoreInstanceFieldInstr(
-            Bigint::digits_offset(),
-            receiver,
-            value,
-            kEmitStoreBarrier,
-            node->token_pos());
-        Do(store);
-        ConstantInstr* null_const = new(I) ConstantInstr(
-            Object::ZoneHandle(I, Object::null()));
-        return ReturnDefinition(null_const);
-      }
       case MethodRecognizer::kBigint_getUsed: {
         Value* receiver = Bind(BuildLoadThisVar(node->scope()));
         LoadFieldInstr* load = new(I) LoadFieldInstr(
@@ -3346,23 +3329,6 @@
         load->set_recognized_kind(kind);
         return ReturnDefinition(load);
       }
-      case MethodRecognizer::kBigint_setUsed: {
-        Value* receiver = Bind(BuildLoadThisVar(node->scope()));
-        LocalVariable* value_var =
-            node->scope()->LookupVariable(Symbols::Value(), true);
-        ASSERT(value_var != NULL);
-        Value* value = Bind(new(I) LoadLocalInstr(*value_var));
-        StoreInstanceFieldInstr* store = new(I) StoreInstanceFieldInstr(
-            Bigint::used_offset(),
-            receiver,
-            value,
-            kNoStoreBarrier,
-            node->token_pos());
-        Do(store);
-        ConstantInstr* null_const = new(I) ConstantInstr(
-            Object::ZoneHandle(I, Object::null()));
-        return ReturnDefinition(null_const);
-      }
       case MethodRecognizer::kBigint_getNeg: {
         Value* receiver = Bind(BuildLoadThisVar(node->scope()));
         LoadFieldInstr* load = new(I) LoadFieldInstr(
@@ -3374,23 +3340,6 @@
         load->set_recognized_kind(kind);
         return ReturnDefinition(load);
       }
-      case MethodRecognizer::kBigint_setNeg: {
-        Value* receiver = Bind(BuildLoadThisVar(node->scope()));
-        LocalVariable* value_var =
-            node->scope()->LookupVariable(Symbols::Value(), true);
-        ASSERT(value_var != NULL);
-        Value* value = Bind(new(I) LoadLocalInstr(*value_var));
-        StoreInstanceFieldInstr* store = new(I) StoreInstanceFieldInstr(
-            Bigint::neg_offset(),
-            receiver,
-            value,
-            kEmitStoreBarrier,
-            node->token_pos());
-        Do(store);
-        ConstantInstr* null_const = new(I) ConstantInstr(
-            Object::ZoneHandle(I, Object::null()));
-        return ReturnDefinition(null_const);
-      }
       default:
         break;
     }