[turbofan] Connect non-terminating loops via Terminate.

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties.h"
@@ skipping 235 matching lines @@
       DECLARE_CASE(IfTrue)
       DECLARE_CASE(IfFalse)
       DECLARE_CASE(IfSuccess)
       DECLARE_CASE(Switch)
       DECLARE_CASE(IfValue)
       DECLARE_CASE(IfDefault)
       DECLARE_CASE(Merge)
       DECLARE_CASE(Deoptimize)
       DECLARE_CASE(Return)
       DECLARE_CASE(TailCall)
+      DECLARE_CASE(Terminate)
       DECLARE_CASE(OsrNormalEntry)
       DECLARE_CASE(OsrLoopEntry)
       DECLARE_CASE(Throw)
       DECLARE_CASE(End)
 #undef DECLARE_CASE
       break;
     }
     return NoChange();
   }
 
@@ skipping 24 matching lines @@
       DECLARE_CASE(IfTrue)
       DECLARE_CASE(IfFalse)
       DECLARE_CASE(IfSuccess)
       DECLARE_CASE(Switch)
       DECLARE_CASE(IfValue)
       DECLARE_CASE(IfDefault)
       DECLARE_CASE(Merge)
       DECLARE_CASE(Deoptimize)
       DECLARE_CASE(Return)
       DECLARE_CASE(TailCall)
+      DECLARE_CASE(Terminate)
       DECLARE_CASE(OsrNormalEntry)
       DECLARE_CASE(OsrLoopEntry)
       DECLARE_CASE(Throw)
       DECLARE_CASE(End)
 #undef DECLARE_CASE
       break;
     }
     UNREACHABLE();
     return Bounds();
   }
@@ skipping 326 matching lines @@
 
 
 Bounds Typer::Visitor::TypeIfException(Node* node) {
   return Bounds::Unbounded(zone());
 }
 
 
 // Common operators.
 
 
-Bounds Typer::Visitor::TypeAlways(Node* node) {
-  return Bounds(Type::None(zone()), Type::Boolean(zone()));
-}
-
-
 Bounds Typer::Visitor::TypeParameter(Node* node) {
   return Bounds::Unbounded(zone());
 }
 
 
 Bounds Typer::Visitor::TypeOsrValue(Node* node) {
   if (node->InputAt(0)->opcode() == IrOpcode::kOsrLoopEntry) {
     // Before deconstruction, OSR values have type {None} to avoid polluting
     // the types of phis and other nodes in the graph.
     return Bounds(Type::None(), Type::None());
@@ skipping 1707 matching lines @@
       TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE
     }
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8