[crankshaft] [ia32] Remove dynamic frame alignment optimization.

src/crankshaft/ia32/lithium-ia32.cc

Index: src/crankshaft/ia32/lithium-ia32.cc
diff --git a/src/crankshaft/ia32/lithium-ia32.cc b/src/crankshaft/ia32/lithium-ia32.cc
index 57a9a3c478a28c6a93f1f0db1649535a33a5dba2..aa022f48c6f36cfd79b28f21b1df88d5ef4cf6f1 100644
--- a/src/crankshaft/ia32/lithium-ia32.cc
+++ b/src/crankshaft/ia32/lithium-ia32.cc
@@ -420,13 +420,6 @@ LPlatformChunk* LChunkBuilder::Build() {
   LPhase phase("L_Building chunk", chunk_);
   status_ = BUILDING;
 
-  // Reserve the first spill slot for the state of dynamic alignment.
-  if (info()->IsOptimizing()) {
-    int alignment_state_index = chunk_->GetNextSpillIndex(GENERAL_REGISTERS);
-    DCHECK_EQ(alignment_state_index, 4);
-    USE(alignment_state_index);
-  }
-
   // If compiling for OSR, reserve space for the unoptimized frame,
   // which will be subsumed into this frame.
   if (graph()->has_osr()) {
@@ -2477,11 +2470,6 @@ LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
       Retry(kNotEnoughSpillSlotsForOsr);
       spill_index = 0;
     }
-    if (spill_index == 0) {
-      // The dynamic frame alignment state overwrites the first local.
-      // The first local is saved at the end of the unoptimized frame.
-      spill_index = graph()->osr()->UnoptimizedFrameSlots();
-    }
     spill_index += StandardFrameConstants::kFixedSlotCount;
   }
   return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);