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

src/full-codegen/mips/full-codegen-mips.cc

Index: src/full-codegen/mips/full-codegen-mips.cc
diff --git a/src/full-codegen/mips/full-codegen-mips.cc b/src/full-codegen/mips/full-codegen-mips.cc
index f38c01bbeaa0cc36275a9bf83c31c97d8388da1d..9315643c891d39de3eaa532cf18623ea9421ba45 100644
--- a/src/full-codegen/mips/full-codegen-mips.cc
+++ b/src/full-codegen/mips/full-codegen-mips.cc
@@ -3822,6 +3822,20 @@ void FullCodeGenerator::EmitToString(CallRuntime* expr) {
 }
 
 
+void FullCodeGenerator::EmitToNumber(CallRuntime* expr) {
+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK_EQ(1, args->length());
+
+  // Load the argument into a0 and convert it.
+  VisitForAccumulatorValue(args->at(0));
+  __ mov(a0, result_register());
+
+  ToNumberStub stub(isolate());
+  __ CallStub(&stub);
+  context()->Plug(v0);
+}
+
+
 void FullCodeGenerator::EmitToName(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK_EQ(1, args->length());