Optimize instanceof further...

src/lithium-allocator.cc

Index: src/lithium-allocator.cc
===================================================================
--- src/lithium-allocator.cc	(revision 6109)
+++ src/lithium-allocator.cc	(working copy)
@@ -937,6 +937,9 @@
                                     curr_position.InstructionEnd());
             }
           }
+        }
+
+        if (summary->IsCall() || summary->IsSaveDoubles()) {
           for (int i = 0; i < DoubleRegister::kNumAllocatableRegisters; ++i) {
             if (output == NULL || !output->IsDoubleRegister() ||
                 output->index() != i) {
@@ -1577,6 +1580,11 @@
 }
 
 
+void LAllocator::MarkAsSaveDoubles() {
+  current_summary()->MarkAsSaveDoubles();
+}
+
+
 void LAllocator::RecordDefinition(HInstruction* instr, LUnallocated* operand) {
   operand->set_virtual_register(instr->id());
   current_summary()->SetOutput(operand);