Add UseAny to create a LOperand without register preference....

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
===================================================================
--- src/x64/lithium-x64.h	(revision 6346)
+++ src/x64/lithium-x64.h	(working copy)
@@ -1969,15 +1969,25 @@
   LOperand* UseRegister(HValue* value);
   LOperand* UseRegisterAtStart(HValue* value);
 
-  // A value in a register that may be trashed.
+  // An operand value in a register that may be trashed.
   LOperand* UseTempRegister(HValue* value);
+
+  // An operand value in a register or stack slot.
   LOperand* Use(HValue* value);
   LOperand* UseAtStart(HValue* value);
+
+  // An operand value in a register, stack slot or a constant operand.
   LOperand* UseOrConstant(HValue* value);
   LOperand* UseOrConstantAtStart(HValue* value);
+
+  // An operand value in a register or a constant operand.
   LOperand* UseRegisterOrConstant(HValue* value);
   LOperand* UseRegisterOrConstantAtStart(HValue* value);
 
+  // An operand value in register, stack slot or a constant operand.
+  // Will not be moved to a register even if one is freely available.
+  LOperand* UseAny(HValue* value);
+
   // Methods for setting up define-use relationships.
   // Return the same instruction that they are passed.
   template<int I, int T>