ES6 symbols: Implement Symbol intrinsic and basic functionality

src/arm/stub-cache-arm.cc

Index: src/arm/stub-cache-arm.cc
diff --git a/src/arm/stub-cache-arm.cc b/src/arm/stub-cache-arm.cc
index c905a8a82cd7e56fd9186e866793369b6a7cfbc1..6a5eeada767f38e8f3077cc40ca35ba2e28070fd 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -2504,6 +2504,12 @@ Handle<Code> CallStubCompiler::CompileCallConstant(Handle<Object> object,
       }
       break;
 
+    case SYMBOL_CHECK:
+      // Check that the object is a symbol.
+      __ CompareObjectType(r1, r1, r3, SYMBOL_TYPE);
+      __ b(ne, &miss);
+      break;
+
     case NUMBER_CHECK:
       if (function->IsBuiltin() || !function->shared()->is_classic_mode()) {
         Label fast;