[turbofan] Add support for accessing Uint8ClampedArrays.

src/compiler/type-cache.h

 // 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.
 
 #ifndef V8_COMPILER_TYPE_CACHE_H_
 #define V8_COMPILER_TYPE_CACHE_H_
 
 #include "src/compiler/types.h"
 #include "src/date.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class TypeCache final {
  private:
   // This has to be first for the initialization magic to work.
   AccountingAllocator allocator;
   Zone zone_;
 
  public:
   static TypeCache const& Get();
 
   TypeCache() : zone_(&allocator, ZONE_NAME) {}
 
   Type* const kInt8 = CreateRange<int8_t>();
   Type* const kUint8 = CreateRange<uint8_t>();
   Type* const kUint8Clamped = kUint8;
+  Type* const kUint8OrMinusZeroOrNaN =
+      Type::Union(kUint8, Type::MinusZeroOrNaN(), zone());
   Type* const kInt16 = CreateRange<int16_t>();
   Type* const kUint16 = CreateRange<uint16_t>();
   Type* const kInt32 = Type::Signed32();
   Type* const kUint32 = Type::Unsigned32();
   Type* const kFloat32 = Type::Number();
   Type* const kFloat64 = Type::Number();
 
   Type* const kSmi = Type::SignedSmall();
   Type* const kHoleySmi = Type::Union(kSmi, Type::Hole(), zone());
   Type* const kHeapNumber = Type::Number();
@@ skipping 109 matching lines @@
   }
 
   Zone* zone() { return &zone_; }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_TYPE_CACHE_H_