Optimize the typeof operator.

src/mips/full-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
 // Note on Mips implementation:
 //
@@ skipping 4784 matching lines @@
         PrepareForBailoutForId(expr->MaterializeFalseId(), NO_REGISTERS);
         __ LoadRoot(v0, Heap::kFalseValueRootIndex);
         if (context()->IsStackValue()) __ push(v0);
         __ bind(&done);
       }
       break;
     }
 
     case Token::TYPEOF: {
       Comment cmnt(masm_, "[ UnaryOperation (TYPEOF)");
-      { StackValueContext context(this);
+      {
+        AccumulatorValueContext context(this);
         VisitForTypeofValue(expr->expression());
       }
-      __ CallRuntime(Runtime::kTypeof, 1);
+      __ mov(a3, v0);
+      TypeofStub typeof_stub(isolate());
+      __ CallStub(&typeof_stub);
       context()->Plug(v0);
       break;
     }
 
     default:
       UNREACHABLE();
   }
 }
 
 
@@ skipping 625 matching lines @@
       Assembler::target_address_at(pc_immediate_load_address)) ==
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS