Fix TranscendentalCacheStub broken in r16615.

src/x64/code-stubs-x64.cc

 // Copyright 2013 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 1136 matching lines @@
     __ subq(rsp, Immediate(kDoubleSize));
     __ cvtlsi2sd(xmm1, rax);
     __ movsd(Operand(rsp, 0), xmm1);
     __ movq(rbx, xmm1);
     __ movq(rdx, xmm1);
     __ fld_d(Operand(rsp, 0));
     __ addq(rsp, Immediate(kDoubleSize));
     __ jmp(&loaded, Label::kNear);
 
     __ bind(&input_not_smi);
-    __ TaggedToI(rbx, rax, xmm1, TREAT_MINUS_ZERO_AS_ZERO, &runtime_call);
+    // Check if input is a HeapNumber.
+    __ LoadRoot(rbx, Heap::kHeapNumberMapRootIndex);
+    __ cmpq(rbx, FieldOperand(rax, HeapObject::kMapOffset));
+    __ j(not_equal, &runtime_call);
+    // Input is a HeapNumber. Push it on the FPU stack and load its
+    // bits into rbx.
+    __ fld_d(FieldOperand(rax, HeapNumber::kValueOffset));
+    __ movq(rbx, FieldOperand(rax, HeapNumber::kValueOffset));
     __ movq(rdx, rbx);
 
     __ bind(&loaded);
   } else {  // UNTAGGED.
     __ movq(rbx, xmm1);
     __ movq(rdx, xmm1);
   }
 
   // ST[0] == double value, if TAGGED.
   // rbx = bits of double value.
@@ skipping 5446 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64