[turbofan] Connect non-terminating loops via Terminate.

src/compiler/opcodes.h

 // Copyright 2013 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.
 
 #ifndef V8_COMPILER_OPCODES_H_
 #define V8_COMPILER_OPCODES_H_
 
 // Opcodes for control operators.
 #define CONTROL_OP_LIST(V) \
   V(Start)                 \
   V(Dead)                  \
   V(Loop)                  \
   V(Branch)                \
   V(Switch)                \
   V(IfTrue)                \
   V(IfFalse)               \
   V(IfSuccess)             \
   V(IfException)           \
   V(IfValue)               \
   V(IfDefault)             \
   V(Merge)                 \
   V(Deoptimize)            \
   V(Return)                \
   V(TailCall)              \
+  V(Terminate)             \
   V(OsrNormalEntry)        \
   V(OsrLoopEntry)          \
   V(Throw)                 \
   V(End)
 
 // Opcodes for constant operators.
 #define CONSTANT_OP_LIST(V) \
   V(Int32Constant)          \
   V(Int64Constant)          \
   V(Float32Constant)        \
@@ skipping 12 matching lines @@
   V(FrameState)          \
   V(StateValues)         \
   V(TypedStateValues)    \
   V(Call)                \
   V(Parameter)           \
   V(OsrValue)            \
   V(Projection)
 
 #define COMMON_OP_LIST(V) \
   CONSTANT_OP_LIST(V)     \
-  INNER_OP_LIST(V)        \
-  V(Always)
+  INNER_OP_LIST(V)
 
 // Opcodes for JavaScript operators.
 #define JS_COMPARE_BINOP_LIST(V) \
   V(JSEqual)                     \
   V(JSNotEqual)                  \
   V(JSStrictEqual)               \
   V(JSStrictNotEqual)            \
   V(JSLessThan)                  \
   V(JSGreaterThan)               \
   V(JSLessThanOrEqual)           \
@@ skipping 234 matching lines @@
 #define COUNT_OPCODE(x) +1
             ALL_OP_LIST(COUNT_OPCODE)
 #undef COUNT_OPCODE
   };
 
   // Returns the mnemonic name of an opcode.
   static char const* Mnemonic(Value value);
 
   // Returns true if opcode for common operator.
   static bool IsCommonOpcode(Value value) {
-    return kStart <= value && value <= kAlways;
+    return kStart <= value && value <= kProjection;
   }
 
   // Returns true if opcode for control operator.
   static bool IsControlOpcode(Value value) {
     return kStart <= value && value <= kEnd;
   }
 
   // Returns true if opcode for JavaScript operator.
   static bool IsJsOpcode(Value value) {
     return kJSEqual <= value && value <= kJSStackCheck;
@@ skipping 22 matching lines @@
            (kNumberEqual <= value && value <= kStringLessThanOrEqual) ||
            (kWord32Equal <= value && value <= kFloat64LessThanOrEqual);
   }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_