Reapply "Eliminate dependencies on assemblers and code stubs in precompiled runtime."

runtime/vm/runtime_entry_x64.cc

Index: runtime/vm/runtime_entry_x64.cc
diff --git a/runtime/vm/runtime_entry_x64.cc b/runtime/vm/runtime_entry_x64.cc
index dfd0840cd77002ece4dfaee8d56753b189571a02..04bf85624314845461355d09ddecd09487ef72dd 100644
--- a/runtime/vm/runtime_entry_x64.cc
+++ b/runtime/vm/runtime_entry_x64.cc
@@ -18,6 +18,7 @@ uword RuntimeEntry::GetEntryPoint() const {
   return reinterpret_cast<uword>(function());
 }
 
+#if !defined(DART_PRECOMPILED_RUNTIME)
 // Generate code to call into the stub which will call the runtime
 // function. Input for the stub is as follows:
 //   RSP : points to the arguments and return value array.
@@ -37,6 +38,7 @@ void RuntimeEntry::Call(Assembler* assembler, intptr_t argument_count) const {
     __ CallToRuntime();
   }
 }
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)
 
 }  // namespace dart