[turbofan] Correctify lowering of Uint8ClampedArray buffer access.

src/compiler/simplified-operator.cc

 // Copyright 2012 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/compiler/simplified-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/types-inl.h"
@@ skipping 10 matching lines @@
       return os << "tagged base";
   }
   UNREACHABLE();
   return os;
 }
 
 
 MachineType BufferAccess::machine_type() const {
   switch (external_array_type_) {
     case kExternalUint8Array:
+    case kExternalUint8ClampedArray:
       return kMachUint8;
     case kExternalInt8Array:
       return kMachInt8;
     case kExternalUint16Array:
       return kMachUint16;
     case kExternalInt16Array:
       return kMachInt16;
     case kExternalUint32Array:
       return kMachUint32;
     case kExternalInt32Array:
       return kMachInt32;
     case kExternalFloat32Array:
       return kMachFloat32;
     case kExternalFloat64Array:
       return kMachFloat64;
-    case kExternalUint8ClampedArray:
-      break;
   }
   UNREACHABLE();
   return kMachNone;
 }
 
 
 bool operator==(BufferAccess lhs, BufferAccess rhs) {
   return lhs.external_array_type() == rhs.external_array_type();
 }
 
@@ skipping 224 matching lines @@
         Operator1<Type>(IrOpcode::k##Name, Operator::kNoThrow | properties,    \
                         #Name, value_input_count, 1, control_input_count,      \
                         output_count, 1, 0, access);                           \
   }
 ACCESS_OP_LIST(ACCESS)
 #undef ACCESS
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8