[turbofan] Remove some dead code from the EffectControlLinearizer.

The manual input trimming inside the EffectControlLinearizer is no
longer necessary, since we have to do explicit graph trimming before
running the MemoryOptimizer anyways these days.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2144603002
Cr-Commit-Position: refs/heads/master@{#37681}

src/compiler/effect-control-linearizer.cc

@@ -340,7 +340,6 @@ void EffectControlLinearizer::ProcessNode(Node* node, Node** frame_state,
     // effect that is passed. The frame state is preserved for lowering.
     DCHECK_EQ(RegionObservability::kObservable, region_observability_);
     *frame_state = NodeProperties::GetFrameStateInput(node, 0);
-    node->TrimInputCount(0);
     return;
   }
 
@@ -805,9 +804,6 @@ EffectControlLinearizer::LowerCheckBounds(Node* node, Node* frame_state,
   control = effect = graph()->NewNode(common()->DeoptimizeUnless(), check,
                                       frame_state, effect, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(index, effect, control);
 }
 
@@ -838,9 +834,6 @@ EffectControlLinearizer::LowerCheckNumber(Node* node, Node* frame_state,
   control = graph()->NewNode(common()->Merge(2), if_true0, if_false0);
   effect = graph()->NewNode(common()->EffectPhi(2), etrue0, efalse0, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -852,9 +845,6 @@ EffectControlLinearizer::LowerCheckIf(Node* node, Node* frame_state,
   control = effect = graph()->NewNode(common()->DeoptimizeUnless(), value,
                                       frame_state, effect, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -867,9 +857,6 @@ EffectControlLinearizer::LowerCheckTaggedPointer(Node* node, Node* frame_state,
   control = effect = graph()->NewNode(common()->DeoptimizeIf(), check,
                                       frame_state, effect, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -882,9 +869,6 @@ EffectControlLinearizer::LowerCheckTaggedSigned(Node* node, Node* frame_state,
   control = effect = graph()->NewNode(common()->DeoptimizeUnless(), check,
                                       frame_state, effect, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -903,9 +887,6 @@ EffectControlLinearizer::LowerCheckedInt32Add(Node* node, Node* frame_state,
 
   value = graph()->NewNode(common()->Projection(0), value, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -924,9 +905,6 @@ EffectControlLinearizer::LowerCheckedInt32Sub(Node* node, Node* frame_state,
 
   value = graph()->NewNode(common()->Projection(0), value, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -1006,9 +984,6 @@ EffectControlLinearizer::LowerCheckedInt32Div(Node* node, Node* frame_state,
   control = effect = graph()->NewNode(common()->DeoptimizeUnless(), check,
                                       frame_state, effect, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -1082,9 +1057,6 @@ EffectControlLinearizer::LowerCheckedInt32Mod(Node* node, Node* frame_state,
       graph()->NewNode(common()->Phi(MachineRepresentation::kWord32, 2), vtrue0,
                        vfalse0, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -1100,9 +1072,6 @@ EffectControlLinearizer::LowerCheckedUint32ToInt32(Node* node,
   control = effect = graph()->NewNode(common()->DeoptimizeUnless(), is_safe,
                                       frame_state, effect, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -1152,9 +1121,6 @@ EffectControlLinearizer::LowerCheckedFloat64ToInt32(Node* node,
                                                     Node* control) {
   Node* value = node->InputAt(0);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return BuildCheckedFloat64ToInt32(value, frame_state, effect, control);
 }
 
@@ -1202,9 +1168,6 @@ EffectControlLinearizer::LowerCheckedTaggedToInt32(Node* node,
   value = graph()->NewNode(common()->Phi(MachineRepresentation::kWord32, 2),
                            vtrue, vfalse, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -1276,9 +1239,6 @@ EffectControlLinearizer::LowerCheckedTaggedToFloat64(Node* node,
       graph()->NewNode(common()->Phi(MachineRepresentation::kFloat64, 2), vtrue,
                        number_state.value, merge);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(result, effect_phi, merge);
 }
 
@@ -1639,9 +1599,6 @@ EffectControlLinearizer::LowerCheckFloat64Hole(Node* node, Node* frame_state,
   control = effect = graph()->NewNode(common()->DeoptimizeIf(), check,
                                       frame_state, effect, control);
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }
 
@@ -1664,9 +1621,6 @@ EffectControlLinearizer::LowerCheckTaggedHole(Node* node, Node* frame_state,
       break;
   }
 
-  // Make sure the lowered node does not appear in any use lists.
-  node->TrimInputCount(0);
-
   return ValueEffectControl(value, effect, control);
 }