[turbofan] Introduce TruncateTaggedToBit operator for ToBoolean truncation.

src/compiler/verifier.cc

Index: src/compiler/verifier.cc
diff --git a/src/compiler/verifier.cc b/src/compiler/verifier.cc
index 85592d8d991e6d8703a48f4111a94e9eb33d82d9..67467cf990efeb169669b419639541c8e54c4ecf 100644
--- a/src/compiler/verifier.cc
+++ b/src/compiler/verifier.cc
@@ -993,6 +993,9 @@ void Verifier::Visitor::Check(Node* node) {
       // CheckTypeIs(node, to));
       break;
     }
+    case IrOpcode::kTruncateTaggedToBit:
+      break;
+
     case IrOpcode::kCheckBounds:
       CheckValueInputIs(node, 0, Type::Any());
       CheckValueInputIs(node, 1, Type::Unsigned31());