Improve ClampDoubleToUint8 on ia32/x64

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
===================================================================
--- src/x64/lithium-x64.cc	(revision 12749)
+++ src/x64/lithium-x64.cc	(working copy)
@@ -1697,8 +1697,7 @@
   Representation input_rep = value->representation();
   LOperand* reg = UseRegister(value);
   if (input_rep.IsDouble()) {
-    return DefineAsRegister(new(zone()) LClampDToUint8(reg,
-                                               TempRegister()));
+    return DefineAsRegister(new(zone()) LClampDToUint8(reg));
   } else if (input_rep.IsInteger32()) {
     return DefineSameAsFirst(new(zone()) LClampIToUint8(reg));
   } else {
@@ -1706,7 +1705,6 @@
     // Register allocator doesn't (yet) support allocation of double
     // temps. Reserve xmm1 explicitly.
     LClampTToUint8* result = new(zone()) LClampTToUint8(reg,
-                                                        TempRegister(),
                                                         FixedTemp(xmm1));
     return AssignEnvironment(DefineSameAsFirst(result));
   }