ARM: Add support for temp double registers in Crankshaft.

src/lithium.h

Index: src/lithium.h
diff --git a/src/lithium.h b/src/lithium.h
index 1e0784eb98da891e9cde48919d91706cce13ac39..446ca1a8e1de1d8e47650fa18579388ee82b4a69 100644
--- a/src/lithium.h
+++ b/src/lithium.h
@@ -103,6 +103,7 @@ class LUnallocated: public LOperand {
     FIXED_REGISTER,
     FIXED_DOUBLE_REGISTER,
     MUST_HAVE_REGISTER,
+    TEMP_DOUBLE_REGISTER,
     WRITABLE_REGISTER,
     SAME_AS_FIRST_INPUT
   };
@@ -212,6 +213,10 @@ class LUnallocated: public LOperand {
         extended_policy() == WRITABLE_REGISTER ||
         extended_policy() == MUST_HAVE_REGISTER);
   }
+  bool HasTempDoubleRegisterPolicy() const {
+    return basic_policy() == EXTENDED_POLICY &&
+        extended_policy() == TEMP_DOUBLE_REGISTER;
+  }
   bool HasSameAsInputPolicy() const {
     return basic_policy() == EXTENDED_POLICY &&
         extended_policy() == SAME_AS_FIRST_INPUT;