Eliminate dependencies on assemblers and code stubs in precompiled runtime.

runtime/vm/runtime_entry_arm.cc

Index: runtime/vm/runtime_entry_arm.cc
diff --git a/runtime/vm/runtime_entry_arm.cc b/runtime/vm/runtime_entry_arm.cc
index 846b91b6edfde13523823f59d3190231d0506242..e57c0cf16b3fe45d3bf6fe98021d254c419bddcf 100644
--- a/runtime/vm/runtime_entry_arm.cc
+++ b/runtime/vm/runtime_entry_arm.cc
@@ -38,6 +38,7 @@ uword RuntimeEntry::GetEntryPoint() const {
 }
 
 
+#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:
 //   SP : points to the arguments and return value array.
@@ -55,6 +56,7 @@ void RuntimeEntry::Call(Assembler* assembler, intptr_t argument_count) const {
     __ BranchLinkToRuntime();
   }
 }
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)
 
 }  // namespace dart