Move global V8::UseCrankshaft() into the Isolate.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 4830fafe35c323598e0bd6a49ed6f7a7ef6569ca..174fbdd7e6ebcd3834de0bc8b2c954694999b973 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -8346,7 +8346,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InstallRecompiledCode) {
   HandleScope handle_scope(isolate);
   ASSERT(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
-  ASSERT(V8::UseCrankshaft() && FLAG_concurrent_recompilation);
+  ASSERT(isolate->use_crankshaft() && FLAG_concurrent_recompilation);
   isolate->optimizing_compiler_thread()->InstallOptimizedFunctions();
   return function->code();
 }
@@ -8532,7 +8532,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_NeverOptimizeFunction) {
 RUNTIME_FUNCTION(MaybeObject*, Runtime_GetOptimizationStatus) {
   HandleScope scope(isolate);
   RUNTIME_ASSERT(args.length() == 1 || args.length() == 2);
-  if (!V8::UseCrankshaft()) {
+  if (!isolate->use_crankshaft()) {
     return Smi::FromInt(4);  // 4 == "never".
   }
   bool sync_with_compiler_thread = true;