Revert "Made test.py not mention the defunct --crankshaft flag."

src/x64/lithium-codegen-x64.cc

 // Copyright 2011 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 2726 matching lines @@
     __ movsd(xmm0, left_reg);
 #ifdef _WIN64
     ASSERT(ToRegister(right).is(rdx));
 #else
     ASSERT(ToRegister(right).is(rdi));
 #endif
     __ CallCFunction(
         ExternalReference::power_double_int_function(isolate()), 2);
   } else {
     ASSERT(exponent_type.IsTagged());
+    CpuFeatures::Scope scope(SSE2);
     Register right_reg = ToRegister(right);
 
     Label non_smi, call;
     __ JumpIfNotSmi(right_reg, &non_smi);
     __ SmiToInteger32(right_reg, right_reg);
     __ cvtlsi2sd(xmm1, right_reg);
     __ jmp(&call);
 
     __ bind(&non_smi);
     __ CmpObjectType(right_reg, HEAP_NUMBER_TYPE , kScratchRegister);
@@ skipping 1194 matching lines @@
   RegisterEnvironmentForDeoptimization(environment);
   ASSERT(osr_pc_offset_ == -1);
   osr_pc_offset_ = masm()->pc_offset();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64