[turbofan] Correctly handle illegal redeclarations.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index f44f092ccf2322e427db648f153cb2a3dd480f90..ef27b81038f0784a85dcd4de9f998b265b41edb5 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -348,10 +348,6 @@ OptimizedCompileJob::Status OptimizedCompileJob::CreateGraph() {
     return AbortOptimization(kTooManyParametersLocals);
   }
 
-  if (scope->HasIllegalRedeclaration()) {
-    return AbortOptimization(kFunctionWithIllegalRedeclaration);
-  }
-
   // Check the whitelist for Crankshaft.
   if (!info()->closure()->PassesFilter(FLAG_hydrogen_filter)) {
     return AbortOptimization(kHydrogenFilter);
@@ -409,6 +405,11 @@ OptimizedCompileJob::Status OptimizedCompileJob::CreateGraph() {
   // Do not use Crankshaft if the code is intended to be serialized.
   if (!isolate()->use_crankshaft()) return SetLastStatus(FAILED);
 
+  if (scope->HasIllegalRedeclaration()) {
+    // Crankshaft cannot handle illegal redeclarations.
+    return AbortOptimization(kFunctionWithIllegalRedeclaration);
+  }
+
   if (FLAG_trace_opt) {
     OFStream os(stdout);
     os << "[compiling method " << Brief(*info()->closure())