Two small fixes for the Math.sin and Math.cos optimizations.

src/arm/codegen-arm.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3398 matching lines @@
   VirtualFrame::SpilledScope spilled_scope;
   ASSERT(args->length() == 0);
   __ Call(ExternalReference::random_positive_smi_function().address(),
           RelocInfo::RUNTIME_ENTRY);
   frame_->EmitPush(r0);
 }
 
 
 void CodeGenerator::GenerateFastMathOp(MathOp op, ZoneList<Expression*>* args) {
   VirtualFrame::SpilledScope spilled_scope;
-  Load(args->at(0));
+  LoadAndSpill(args->at(0));
   switch (op) {
     case SIN:
       __ CallRuntime(Runtime::kMath_sin, 1);
       break;
     case COS:
       __ CallRuntime(Runtime::kMath_cos, 1);
       break;
   }
   frame_->EmitPush(r0);
 }
@@ skipping 2247 matching lines @@
   __ mov(r2, Operand(0));
   __ GetBuiltinEntry(r3, Builtins::CALL_NON_FUNCTION);
   __ Jump(Handle<Code>(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline)),
           RelocInfo::CODE_TARGET);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal