[turbofan]: delay ssa deconstruction in register allocator

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index 567b1c920f00ff86273dec94e4e4fb6ea5356330..da8dafddf9e0506268c53b19fb360ad7b977f84b 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -925,16 +925,15 @@ void InstructionSelector::VisitParameter(Node* node) {
 
 
 void InstructionSelector::VisitPhi(Node* node) {
-  // TODO(bmeurer): Emit a PhiInstruction here.
+  const int input_count = node->op()->ValueInputCount();
   PhiInstruction* phi = new (instruction_zone())
-      PhiInstruction(instruction_zone(), GetVirtualRegister(node));
+      PhiInstruction(instruction_zone(), GetVirtualRegister(node),
+                     static_cast<size_t>(input_count));
   sequence()->InstructionBlockAt(current_block_->GetRpoNumber())->AddPhi(phi);
-  const int input_count = node->op()->ValueInputCount();
-  phi->operands().reserve(static_cast<size_t>(input_count));
   for (int i = 0; i < input_count; ++i) {
     Node* const input = node->InputAt(i);
     MarkAsUsed(input);
-    phi->operands().push_back(GetVirtualRegister(input));
+    phi->Extend(instruction_zone(), GetVirtualRegister(input));
   }
 }