Remove support for legacy const, part 1

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 3d6805d88fbdc9f2b027940806328b8169fb2a8f..fac34b211fc7c2c32e2fadc27f6ccbd4b1cb5e09 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -511,11 +511,6 @@ OptimizedCompileJob::Status OptimizedCompileJob::CreateGraph() {
     return AbortOptimization(kTooManyParametersLocals);
   }
 
-  if (scope->HasIllegalRedeclaration()) {
-    // Crankshaft cannot handle illegal redeclarations.
-    return AbortOptimization(kFunctionWithIllegalRedeclaration);
-  }
-
   if (FLAG_trace_opt) {
     OFStream os(stdout);
     os << "[compiling method " << Brief(*info()->closure())