VM: New calling convention for generated code.

runtime/vm/gc_marker.cc

Index: runtime/vm/gc_marker.cc
diff --git a/runtime/vm/gc_marker.cc b/runtime/vm/gc_marker.cc
index 234bf973476eb04b5b2b17c9dc278fa104761486..40ae97ac920b0454c99a8cc6b970d36aa63ac410 100644
--- a/runtime/vm/gc_marker.cc
+++ b/runtime/vm/gc_marker.cc
@@ -246,15 +246,15 @@ class MarkingVisitor : public ObjectPointerVisitor {
     intptr_t current_code_count = 0;
     for (int i = 0; i < skipped_code_functions_.length(); i++) {
       RawFunction* func = skipped_code_functions_[i];
-      RawCode* code = func->ptr()->instructions_->ptr()->code_;
+      RawCode* code = func->ptr()->code_;
       if (!code->IsMarked()) {
         // If the code wasn't strongly visited through other references
         // after skipping the function's code pointer, then we disconnect the
         // code from the function.
         StubCode* stub_code = isolate()->stub_code();
         func->StorePointer(
-            &(func->ptr()->instructions_),
-            stub_code->LazyCompile_entry()->code()->ptr()->instructions_);
+            &(func->ptr()->code_),
+            stub_code->LazyCompile_entry()->code());
         if (FLAG_log_code_drop) {
           // NOTE: This code runs while GC is in progress and runs within
           // a NoHandleScope block. Hence it is not okay to use a regular Zone