Track which entries in the ObjectPool are native entries, and reset them when loading a precompiled…

runtime/vm/assembler_x64.cc

Index: runtime/vm/assembler_x64.cc
diff --git a/runtime/vm/assembler_x64.cc b/runtime/vm/assembler_x64.cc
index fcab5eafb922677ce26acc847fd68ac7d4211bf3..863bf622d876bed7f5c1babcbec8303d62f31b41 100644
--- a/runtime/vm/assembler_x64.cc
+++ b/runtime/vm/assembler_x64.cc
@@ -70,6 +70,15 @@ void Assembler::LoadExternalLabel(Register dst,
 }
 
 
+void Assembler::LoadNativeEntry(Register dst,
+                                const ExternalLabel* label,
+                                Patchability patchable) {
+  const int32_t offset = ObjectPool::element_offset(
+      object_pool_wrapper_.FindNativeEntry(label, patchable));
+  LoadWordFromPoolOffset(dst, offset - kHeapObjectTag);
+}
+
+
 void Assembler::call(const ExternalLabel* label) {
   {  // Encode movq(TMP, Immediate(label->address())), but always as imm64.
     AssemblerBuffer::EnsureCapacity ensured(&buffer_);