Clean up global variables related to precompilation.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index ebdd48b21d3f91f2f0bfb85714b6654a7b783a12..3bdf2bd79b7ea0bcb65c9fa4093df783e2b00971 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -27,6 +27,7 @@ namespace dart {
 DECLARE_FLAG(bool, allow_absolute_addresses);
 DECLARE_FLAG(bool, emit_edge_counters);
 DECLARE_FLAG(int, optimization_counter_threshold);
+DECLARE_FLAG(bool, precompilation);
 DECLARE_FLAG(bool, use_osr);
 
 // Generic summary for call instructions that have all arguments pushed
@@ -2231,7 +2232,7 @@ 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();