Reimplement dynamic frame alignment for frames that are compiled via OSR or have more than 2 double…

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index e69b66c1ba2d69336bdecd7ddf1021113f3a5772..c729b19ef7c22b4e83e08740cdbc8113aa7990c9 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -368,7 +368,11 @@ void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
 
 int LChunk::GetNextSpillIndex(bool is_double) {
   // Skip a slot if for a double-width slot.
-  if (is_double) spill_slot_count_++;
+  if (is_double) {
+    spill_slot_count_++;
+    spill_slot_count_ |= 1;
+    num_double_slots_++;
+  }
   return spill_slot_count_++;
 }
 
@@ -550,6 +554,12 @@ LChunk* LChunkBuilder::Build() {
   chunk_ = new(zone()) LChunk(info(), graph());
   HPhase phase("L_Building chunk", chunk_);
   status_ = BUILDING;
+
+  // Reserve the first spill slot for the state of dynamic alignment.
+  int alignment_state_index = chunk_->GetNextSpillIndex(false);
+  ASSERT_EQ(alignment_state_index, 0);
+  USE(alignment_state_index);
+
   const ZoneList<HBasicBlock*>* blocks = graph()->blocks();
   for (int i = 0; i < blocks->length(); i++) {
     HBasicBlock* next = NULL;