[Atomics] Make Atomics.compareExchange a builtin using TF

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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 <limits>
 
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 2225 matching lines @@
     }
     case kAtomicExchangeUint16: {
       __ xchgw(i.InputRegister(0), i.MemoryOperand(1));
       __ movzxwl(i.InputRegister(0), i.InputRegister(0));
       break;
     }
     case kAtomicExchangeWord32: {
       __ xchgl(i.InputRegister(0), i.MemoryOperand(1));
       break;
     }
+    case kAtomicCompareExchangeInt8: {
+      __ cmpxchgb(i.MemoryOperand(2), i.InputRegister(1));
+      __ movsxbl(rax, rax);
+      break;
+    }
+    case kAtomicCompareExchangeUint8: {
+      __ cmpxchgb(i.MemoryOperand(2), i.InputRegister(1));
+      __ movzxbl(rax, rax);
+      break;
+    }
+    case kAtomicCompareExchangeInt16: {
+      __ cmpxchgw(i.MemoryOperand(2), i.InputRegister(1));
+      __ movsxwl(rax, rax);
+      break;
+    }
+    case kAtomicCompareExchangeUint16: {
+      __ cmpxchgw(i.MemoryOperand(2), i.InputRegister(1));
+      __ movzxwl(rax, rax);
+      break;
+    }
+    case kAtomicCompareExchangeWord32: {
+      __ cmpxchgl(i.MemoryOperand(2), i.InputRegister(1));
+      break;
+    }
     case kAtomicLoadInt8:
     case kAtomicLoadUint8:
     case kAtomicLoadInt16:
     case kAtomicLoadUint16:
     case kAtomicLoadWord32:
     case kAtomicStoreWord8:
     case kAtomicStoreWord16:
     case kAtomicStoreWord32:
       UNREACHABLE();  // Won't be generated by instruction selector.
       break;
@@ skipping 617 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8