[Atomics] Make Atomics.exchange a builtin using TF

src/compiler/mips64/code-generator-mips64.cc

 // 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.
 
 #include "src/compiler/code-generator.h"
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 1898 matching lines @@
       break;
     case kAtomicStoreWord8:
       ASSEMBLE_ATOMIC_STORE_INTEGER(sb);
       break;
     case kAtomicStoreWord16:
       ASSEMBLE_ATOMIC_STORE_INTEGER(sh);
       break;
     case kAtomicStoreWord32:
       ASSEMBLE_ATOMIC_STORE_INTEGER(sw);
       break;
+    case kAtomicExchangeInt8:
+    case kAtomicExchangeUint8:
+    case kAtomicExchangeInt16:
+    case kAtomicExchangeUint16:
+    case kAtomicExchangeWord32:
+      UNREACHABLE();
+      break;
     case kMips64AssertEqual:
       __ Assert(eq, static_cast<BailoutReason>(i.InputOperand(2).immediate()),
                 i.InputRegister(0), Operand(i.InputRegister(1)));
       break;
   }
   return kSuccess;
 }  // NOLINT(readability/fn_size)
 
 
 #define UNSUPPORTED_COND(opcode, condition)                                  \
@@ skipping 747 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8