Improve code generation for the HRandom instruction.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index ff0c61bdf6fc01c4253d175c18123974e8ed39d7..b3d08c8a4c08f9f07996439a63660840e9015a34 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1404,13 +1404,22 @@ class LPower V8_FINAL : public LTemplateInstruction<1, 2, 0> {
 };
 
 
-class LRandom V8_FINAL : public LTemplateInstruction<1, 1, 0> {
+class LRandom V8_FINAL : public LTemplateInstruction<1, 1, 3> {
  public:
-  explicit LRandom(LOperand* global_object) {
+  LRandom(LOperand* global_object,
+          LOperand* scratch,
+          LOperand* scratch2,
+          LOperand* scratch3) {
     inputs_[0] = global_object;
+    temps_[0] = scratch;
+    temps_[1] = scratch2;
+    temps_[2] = scratch3;
   }
 
   LOperand* global_object() { return inputs_[0]; }
+  LOperand* scratch() const { return temps_[0]; }
+  LOperand* scratch2() const { return temps_[1]; }
+  LOperand* scratch3() const { return temps_[2]; }
 
   DECLARE_CONCRETE_INSTRUCTION(Random, "random")
   DECLARE_HYDROGEN_ACCESSOR(Random)