Remove left-over compiler-code from precompiled runtime.

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 37188b64b9a325da84a56725f5bc477dafefc927..6de22b790f1e574b56e23a5b9e05608226cb15d6 100644
--- a/runtime/vm/code_generator.cc
+++ b/runtime/vm/code_generator.cc
@@ -1572,6 +1572,7 @@ DEFINE_RUNTIME_ENTRY(FixCallersTarget, 0) {
 // The caller tried to allocate an instance via an invalidated allocation
 // stub.
 DEFINE_RUNTIME_ENTRY(FixAllocationStubTarget, 0) {
+#if !defined(DART_PRECOMPILED_RUNTIME)
   StackFrameIterator iterator(StackFrameIterator::kDontValidateFrames);
   StackFrame* frame = iterator.NextFrame();
   ASSERT(frame != NULL);
@@ -1607,6 +1608,9 @@ DEFINE_RUNTIME_ENTRY(FixAllocationStubTarget, 0) {
         alloc_stub.EntryPoint());
   }
   arguments.SetReturn(alloc_stub);
+#else
+  UNREACHABLE();
+#endif
 }