Revert "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 b7d6bc95ce6f6bc72819113e80f51c49a5043eeb..1d151d03c4e6298710b59c8366f223a2a5bee4fc 100644
--- a/runtime/vm/gc_marker.cc
+++ b/runtime/vm/gc_marker.cc
@@ -91,14 +91,14 @@ class SkippedCodeFunctions : public ZoneAllocated {
     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()->code_;
+      RawCode* code = func->ptr()->instructions_->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.
         func->StorePointer(
-            &(func->ptr()->code_),
-            StubCode::LazyCompile_entry()->code());
+            &(func->ptr()->instructions_),
+            StubCode::LazyCompile_entry()->code()->ptr()->instructions_);
         uword entry_point = StubCode::LazyCompile_entry()->EntryPoint();
         func->ptr()->entry_point_ = entry_point;
         if (FLAG_log_code_drop) {