VM: Cache instructions entry point in RawFunction/RawCode.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 73cd49cbcbf420c9fc1d93679fb659193017f27c..c7f853f8977f29d53f482261bd5f22b50ab08d76 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -5200,6 +5200,7 @@ bool Function::HasBreakpoint() const {
 
 void Function::SetInstructions(const Code& value) const {
   StorePointer(&raw_ptr()->instructions_, value.instructions());
+  StoreNonPointer(&raw_ptr()->entry_point_, value.EntryPoint());
 }
 
 void Function::AttachCode(const Code& value) const {
@@ -5220,8 +5221,7 @@ bool Function::HasCode() const {
 void Function::ClearCode() const {
   ASSERT(ic_data_array() == Array::null());
   StorePointer(&raw_ptr()->unoptimized_code_, Code::null());
-  StorePointer(&raw_ptr()->instructions_,
-      Code::Handle(StubCode::LazyCompile_entry()->code()).instructions());
+  SetInstructions(Code::Handle(StubCode::LazyCompile_entry()->code()));
 }