Revert of [turbofan] Introduce TruncateTaggedToBit operator for ToBoolean truncation.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 239839a37b6017f3fee443c2fb410d3fada17dff..449c882e79c5c3ff9bf9fd1ea3cd55b8160b509f 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -1212,18 +1212,6 @@
       //------------------------------------------------------------------
       // JavaScript operators.
       //------------------------------------------------------------------
-      case IrOpcode::kJSToBoolean: {
-        if (truncation.TruncatesToBool()) {
-          ProcessInput(node, 0, UseInfo::Bool());
-          ProcessInput(node, 1, UseInfo::None());
-          SetOutput(node, MachineRepresentation::kBit);
-          if (lower()) DeferReplacement(node, node->InputAt(0));
-        } else {
-          VisitInputs(node);
-          SetOutput(node, MachineRepresentation::kTagged);
-        }
-        return;
-      }
       case IrOpcode::kJSToNumber: {
         VisitInputs(node);
         // TODO(bmeurer): Optimize somewhat based on input type?