VM: Fix bug in the new edge counter code on ARM and MIPS.

The offset into the edge counter array may exceed the limit
of what fits into an Address operand on ARM and MIPS.

BUG=
[email protected]

Review URL: https://codereview.chromium.org//1373013002 .

Author: fsc8000

runtime/vm/flow_graph_compiler_arm.cc

@@ -1188,17 +1188,16 @@ void FlowGraphCompiler::EmitEdgeCounter(intptr_t edge_id) {
   // optimization/deoptimization cycles we will attempt.
   ASSERT(!edge_counters_array_.IsNull());
   ASSERT(assembler_->constant_pool_allowed());
-  const Array& counter = Array::ZoneHandle(zone(), Array::New(1, Heap::kOld));
-  counter.SetAt(0, Smi::Handle(zone(), Smi::New(0)));
   __ Comment("Edge counter");
   __ LoadObject(R0, edge_counters_array_);
 #if defined(DEBUG)
   bool old_use_far_branches = assembler_->use_far_branches();
   assembler_->set_use_far_branches(true);
 #endif  // DEBUG
-  __ ldr(IP, FieldAddress(R0, Array::element_offset(edge_id)));
-  __ add(IP, IP, Operand(Smi::RawValue(1)));
-  __ StoreIntoSmiField(FieldAddress(R0, Array::element_offset(edge_id)), IP);
+  __ LoadFieldFromOffset(kWord, R1, R0, Array::element_offset(edge_id));
+  __ add(R1, R1, Operand(Smi::RawValue(1)));
+  __ StoreIntoObjectNoBarrierOffset(
+      R0, Array::element_offset(edge_id), R1, Assembler::kOnlySmi);
 #if defined(DEBUG)
   assembler_->set_use_far_branches(old_use_far_branches);
 #endif  // DEBUG

runtime/vm/flow_graph_compiler_mips.cc

@@ -1207,9 +1207,9 @@ void FlowGraphCompiler::EmitEdgeCounter(intptr_t edge_id) {
   ASSERT(!edge_counters_array_.IsNull());
   __ Comment("Edge counter");
   __ LoadObject(T0, edge_counters_array_);
-  __ lw(T1, FieldAddress(T0, Array::element_offset(edge_id)));
+  __ LoadFieldFromOffset(T1, T0, Array::element_offset(edge_id));
   __ AddImmediate(T1, T1, Smi::RawValue(1));
-  __ sw(T1, FieldAddress(T0, Array::element_offset(edge_id)));
+  __ StoreFieldToOffset(T1, T0, Array::element_offset(edge_id));
 }