Reland of Fix compiler warnings on "make android_arm"

src/deoptimize-reason.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/deoptimize-reason.h"
 
 namespace v8 {
 namespace internal {
 
 std::ostream& operator<<(std::ostream& os, DeoptimizeReason reason) {
   switch (reason) {
 #define DEOPTIMIZE_REASON(Name, message) \
   case DeoptimizeReason::k##Name:        \
     return os << #Name;
     DEOPTIMIZE_REASON_LIST(DEOPTIMIZE_REASON)
 #undef DEOPTIMIZE_REASON
   }
   UNREACHABLE();
   return os;
 }
 
 size_t hash_value(DeoptimizeReason reason) {
   return static_cast<uint8_t>(reason);
 }
 
-char const* const DeoptimizeReasonToString(DeoptimizeReason reason) {
+char const* DeoptimizeReasonToString(DeoptimizeReason reason) {
   static char const* kDeoptimizeReasonStrings[] = {
 #define DEOPTIMIZE_REASON(Name, message) message,
       DEOPTIMIZE_REASON_LIST(DEOPTIMIZE_REASON)
 #undef DEOPTIMIZE_REASON
   };
   size_t const index = static_cast<size_t>(reason);
   DCHECK_LT(index, arraysize(kDeoptimizeReasonStrings));
   return kDeoptimizeReasonStrings[index];
 }
 
 }  // namespace internal
 }  // namespace v8