Merge all Hydrogen phase declarations into hydrogen-phases.h.

src/hydrogen-dce.cc

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-#include "hydrogen-dce.h"
-#include "v8.h"
+#include "hydrogen-phases.h"
 
 namespace v8 {
 namespace internal {
 
 bool HDeadCodeEliminationPhase::MarkLive(HValue* ref, HValue* instr) {
   if (instr->CheckFlag(HValue::kIsLive)) return false;
   instr->SetFlag(HValue::kIsLive);
 
   if (FLAG_trace_dead_code_elimination) {
     HeapStringAllocator allocator;
@@ skipping 76 matching lines @@
   // Process phis separately to avoid simultaneously mutating the phi list.
   while (!worklist.is_empty()) {
     HPhi* phi = worklist.RemoveLast();
     HBasicBlock* block = phi->block();
     phi->DeleteAndReplaceWith(NULL);
     block->RecordDeletedPhi(phi->merged_index());
   }
 }
 
 } }  // namespace v8::internal