[stubs] Suppress shifts with immediate shift of zero.

src/code-stub-assembler.cc

 // Copyright 2016 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/code-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 #include "src/ic/stub-cache.h"
 
@@ skipping 1752 matching lines @@
     Goto(&if_done);
   }
 
   Bind(&if_done);
   return var_result.value();
 }
 
 Node* CodeStubAssembler::BitFieldDecode(Node* word32, uint32_t shift,
                                         uint32_t mask) {
   return Word32Shr(Word32And(word32, Int32Constant(mask)),
-                   Int32Constant(shift));
+                   static_cast<int>(shift));
 }
 
 void CodeStubAssembler::SetCounter(StatsCounter* counter, int value) {
   if (FLAG_native_code_counters && counter->Enabled()) {
     Node* counter_address = ExternalConstant(ExternalReference(counter));
     StoreNoWriteBarrier(MachineRepresentation::kWord32, counter_address,
                         Int32Constant(value));
   }
 }
 
@@ skipping 1348 matching lines @@
   }
   Bind(&miss);
   {
     TailCallRuntime(Runtime::kLoadGlobalIC_Miss, p->context, p->slot,
                     p->vector);
   }
 }
 
 }  // namespace internal
 }  // namespace v8