In background compilation make a copy of Field in order to freeze its state

runtime/vm/intermediate_language_arm64.cc

Index: runtime/vm/intermediate_language_arm64.cc
diff --git a/runtime/vm/intermediate_language_arm64.cc b/runtime/vm/intermediate_language_arm64.cc
index 84884ae471c9cc87a3feac3f4ea3eba8c9f5f7b0..e9c360b40cad0fce7296bece784c1c374094ab1c 100644
--- a/runtime/vm/intermediate_language_arm64.cc
+++ b/runtime/vm/intermediate_language_arm64.cc
@@ -1467,7 +1467,7 @@ void GuardFieldClassInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Label* fail = (deopt != NULL) ? deopt : &fail_label;
 
   if (emit_full_guard) {
-    __ LoadObject(field_reg, Field::ZoneHandle(field().raw()));
+    __ LoadObject(field_reg, Field::ZoneHandle(field().Original()));
 
     FieldAddress field_cid_operand(
         field_reg, Field::guarded_cid_offset(), kUnsignedWord);
@@ -1611,7 +1611,7 @@ void GuardFieldLengthInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 
     Label ok;
 
-    __ LoadObject(field_reg, Field::ZoneHandle(field().raw()));
+    __ LoadObject(field_reg, Field::ZoneHandle(field().Original()));
 
     __ ldr(offset_reg,
            FieldAddress(field_reg,
@@ -1837,7 +1837,7 @@ void StoreInstanceFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
     Label store_float32x4;
     Label store_float64x2;
 
-    __ LoadObject(temp, Field::ZoneHandle(field().raw()));
+    __ LoadObject(temp, *field().OriginalAsHandle(compiler->zone()));

[siva, 2016/02/25 23:38:32]

Ditto.

 
     __ LoadFieldFromOffset(temp2, temp, Field::is_nullable_offset(),
                            kUnsignedWord);
@@ -1975,7 +1975,7 @@ void StoreStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register value = locs()->in(0).reg();
   const Register temp = locs()->temp(0).reg();
 
-  __ LoadObject(temp, field());
+  __ LoadObject(temp, *field().OriginalAsHandle(compiler->zone()));

[siva, 2016/02/25 23:38:32]

Ditto.

[srdjan, 2016/02/26 00:40:42]

Done.

   if (this->value()->NeedsStoreBuffer()) {
     __ StoreIntoObjectOffset(
         temp, Field::static_value_offset(), value, CanValueBeSmi());
@@ -2187,7 +2187,7 @@ void LoadFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
     Label load_float32x4;
     Label load_float64x2;
 
-    __ LoadObject(result_reg, Field::ZoneHandle(field()->raw()));
+    __ LoadObject(result_reg, Field::ZoneHandle(field()->Original()));
 
     FieldAddress field_cid_operand(
         result_reg, Field::guarded_cid_offset(), kUnsignedWord);