Allow more virtual registers to be encoded in LUnallocated.

src/lithium.cc

Index: src/lithium.cc
diff --git a/src/lithium.cc b/src/lithium.cc
index 10d7f71332f791f26fbe794551ad7dacc0120cc9..539f4eefba5bd635d2a41b2a64193c570b1ca181 100644
--- a/src/lithium.cc
+++ b/src/lithium.cc
@@ -58,24 +58,27 @@ void LOperand::PrintTo(StringStream* stream) {
     case UNALLOCATED:
       unalloc = LUnallocated::cast(this);
       stream->Add("v%d", unalloc->virtual_register());
-      switch (unalloc->policy()) {
+      if (unalloc->basic_policy() == LUnallocated::FIXED_SLOT) {
+        stream->Add("(=%dS)", unalloc->fixed_slot_index());
+        break;
+      }
+      switch (unalloc->extended_policy()) {
         case LUnallocated::NONE:
           break;
         case LUnallocated::FIXED_REGISTER: {
+          int reg_index = unalloc->fixed_register_index();
           const char* register_name =
-              Register::AllocationIndexToString(unalloc->fixed_index());
+              Register::AllocationIndexToString(reg_index);
           stream->Add("(=%s)", register_name);
           break;
         }
         case LUnallocated::FIXED_DOUBLE_REGISTER: {
+          int reg_index = unalloc->fixed_register_index();
           const char* double_register_name =
-              DoubleRegister::AllocationIndexToString(unalloc->fixed_index());
+              DoubleRegister::AllocationIndexToString(reg_index);
           stream->Add("(=%s)", double_register_name);
           break;
         }
-        case LUnallocated::FIXED_SLOT:
-          stream->Add("(=%dS)", unalloc->fixed_index());
-          break;
         case LUnallocated::MUST_HAVE_REGISTER:
           stream->Add("(R)");
           break;