More simplification and unification of frame handling

src/crankshaft/mips64/lithium-mips64.cc

Index: src/crankshaft/mips64/lithium-mips64.cc
diff --git a/src/crankshaft/mips64/lithium-mips64.cc b/src/crankshaft/mips64/lithium-mips64.cc
index 78dcd4761c66a0fcdd66c7a23b231ad9d69166ac..6fc4eaffa0a8dac28dae50eb16d94d304c54af29 100644
--- a/src/crankshaft/mips64/lithium-mips64.cc
+++ b/src/crankshaft/mips64/lithium-mips64.cc
@@ -390,8 +390,8 @@ void LTransitionElementsKind::PrintDataTo(StringStream* stream) {
 
 int LPlatformChunk::GetNextSpillIndex(RegisterKind kind) {
   // Skip a slot if for a double-width slot.
-  if (kind == DOUBLE_REGISTERS) spill_slot_count_++;
-  return spill_slot_count_++;
+  if (kind == DOUBLE_REGISTERS) current_frame_slots_++;
+  return current_frame_slots_++;
 }
 
 
@@ -2408,6 +2408,7 @@ LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
       Retry(kTooManySpillSlotsNeededForOSR);
       spill_index = 0;
     }
+    spill_index += StandardFrameConstants::kFixedSlotCount;
   }
   return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
 }