ES6 symbols: Implement Symbol intrinsic and basic functionality

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index 5dc894c1f75afdd73b646706d5ebbc0e324a3108..2cf6fdf1d66380b225265bd0c03ae7671c915461 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -2438,6 +2438,12 @@ Handle<Code> CallStubCompiler::CompileCallConstant(Handle<Object> object,
       }
       break;
 
+    case SYMBOL_CHECK:
+      // Check that the object is a symbol.
+      __ CmpObjectType(edx, SYMBOL_TYPE, eax);
+      __ j(not_equal, &miss);
+      break;
+
     case NUMBER_CHECK:
       if (function->IsBuiltin() || !function->shared()->is_classic_mode()) {
         Label fast;