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

src/hydrogen-minus-zero.cc

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-#include "hydrogen-minus-zero.h"
+#include "hydrogen-phases.h"
 
 namespace v8 {
 namespace internal {
 
 void HComputeMinusZeroChecksPhase::Run() {
   const ZoneList<HBasicBlock*>* blocks(graph()->blocks());
   for (int i = 0; i < blocks->length(); ++i) {
     for (HInstructionIterator it(blocks->at(i)); !it.Done(); it.Advance()) {
       HInstruction* current = it.Current();
       if (current->IsChange()) {
@@ skipping 35 matching lines @@
     if (current->IsMul() || current->IsDiv() || current->IsMathMinMax()) {
       HBinaryOperation* operation = HBinaryOperation::cast(current);
       operation->EnsureAndPropagateNotMinusZero(&visited_);
       PropagateMinusZeroChecks(operation->left());
       PropagateMinusZeroChecks(operation->right());
     }
   }
 }
 
 } }  // namespace v8::internal