Clean up global variables related to precompilation.

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
diff --git a/runtime/vm/intermediate_language_x64.cc b/runtime/vm/intermediate_language_x64.cc
index 8c164fcdbd3d0d6e1affa61abf269cce71f4a725..2c71a1b2d4c061a0fd327feec6e4b76dd5af41e2 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -28,6 +28,7 @@ DECLARE_FLAG(bool, emit_edge_counters);
 DECLARE_FLAG(int, optimization_counter_threshold);
 DECLARE_FLAG(bool, throw_on_javascript_int_overflow);
 DECLARE_FLAG(bool, use_osr);
+DECLARE_FLAG(bool, precompilation);
 
 // Generic summary for call instructions that have all arguments pushed
 // on the stack and return the result in a fixed register RAX.
@@ -2115,7 +2116,7 @@ void CreateArrayInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 
   Label slow_path, done;
   if (compiler->is_optimizing() &&
-      !Compiler::always_optimize() &&
+      !FLAG_precompilation &&
       num_elements()->BindsToConstant() &&
       num_elements()->BoundConstant().IsSmi()) {
     const intptr_t length = Smi::Cast(num_elements()->BoundConstant()).Value();