Fix build.

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
diff --git a/runtime/vm/code_generator.cc b/runtime/vm/code_generator.cc
index ddbfbea8f021ef29bf8cc9c03bd824fff3d5b3b4..ef90b547a1772d3317850f767fa6c6c3fa8b00b0 100644
--- a/runtime/vm/code_generator.cc
+++ b/runtime/vm/code_generator.cc
@@ -1960,7 +1960,7 @@ void DeoptimizeAt(const Code& optimized_code, StackFrame* frame) {
   const Instructions& instrs =
       Instructions::Handle(zone, optimized_code.instructions());
   {
-    WritableInstructionsScope writable(instrs.PayloadStart(), instrs.size());
+    WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size());
     CodePatcher::InsertDeoptimizationCallAt(frame->pc());
     if (FLAG_trace_patching) {
       const String& name = String::Handle(function.name());