Correctify instanceof and make it optimizable.

src/mips/interface-descriptors-mips.cc

Index: src/mips/interface-descriptors-mips.cc
diff --git a/src/mips/interface-descriptors-mips.cc b/src/mips/interface-descriptors-mips.cc
index 544d9eed6e7641a3f78678f5d6374b1fc6f9674d..7edc606dc5586fb7c423ac065863b3343590234e 100644
--- a/src/mips/interface-descriptors-mips.cc
+++ b/src/mips/interface-descriptors-mips.cc
@@ -46,8 +46,8 @@ const Register StoreGlobalViaContextDescriptor::SlotRegister() { return a2; }
 const Register StoreGlobalViaContextDescriptor::ValueRegister() { return a0; }
 
 
-const Register InstanceofDescriptor::left() { return a0; }
-const Register InstanceofDescriptor::right() { return a1; }
+const Register InstanceOfDescriptor::LeftRegister() { return a1; }
+const Register InstanceOfDescriptor::RightRegister() { return a0; }
 
 
 const Register ArgumentsAccessReadDescriptor::index() { return a1; }