[es6] Fix missing bits for full @@toPrimitive support.

src/full-codegen/x87/full-codegen-x87.cc

Index: src/full-codegen/x87/full-codegen-x87.cc
diff --git a/src/full-codegen/x87/full-codegen-x87.cc b/src/full-codegen/x87/full-codegen-x87.cc
index a85152d7a98e8b107c81611a4aeecf21ec3ff8a2..d8396d3b62b4d79631ad804baf11febd4dd3e0e5 100644
--- a/src/full-codegen/x87/full-codegen-x87.cc
+++ b/src/full-codegen/x87/full-codegen-x87.cc
@@ -3697,6 +3697,19 @@ void FullCodeGenerator::EmitToString(CallRuntime* expr) {
 }
 
 
+void FullCodeGenerator::EmitToNumber(CallRuntime* expr) {
+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK_EQ(1, args->length());
+
+  // Load the argument into eax and convert it.
+  VisitForAccumulatorValue(args->at(0));
+
+  ToNumberStub stub(isolate());
+  __ CallStub(&stub);
+  context()->Plug(eax);
+}
+
+
 void FullCodeGenerator::EmitToName(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK_EQ(1, args->length());