[turbofan] Rename {CheckPoint} to {Checkpoint} everywhere.

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_
 
 #include <iosfwd>
 
 // Opcodes for control operators.
@@ skipping 29 matching lines @@
   V(ExternalConstant)         \
   V(NumberConstant)           \
   V(HeapConstant)             \
   V(RelocatableInt32Constant) \
   V(RelocatableInt64Constant)
 
 #define INNER_OP_LIST(V) \
   V(Select)              \
   V(Phi)                 \
   V(EffectPhi)           \
-  V(CheckPoint)          \
+  V(Checkpoint)          \
   V(BeginRegion)         \
   V(FinishRegion)        \
   V(FrameState)          \
   V(StateValues)         \
   V(TypedStateValues)    \
   V(ObjectState)         \
   V(Call)                \
   V(Parameter)           \
   V(OsrValue)            \
   V(Projection)
@@ skipping 572 matching lines @@
   }
 };
 
 std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_