[Atomics] Make Atomics.compareExchange a builtin using TF

src/compiler/ia32/code-generator-ia32.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 "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1940 matching lines @@
     }
     case kAtomicExchangeUint16: {
       __ xchg_w(i.InputRegister(0), i.MemoryOperand(1));
       __ movzx_w(i.InputRegister(0), i.InputRegister(0));
       break;
     }
     case kAtomicExchangeWord32: {
       __ xchg(i.InputRegister(0), i.MemoryOperand(1));
       break;
     }
+    case kAtomicCompareExchangeInt8: {
+      __ cmpxchg_b(i.MemoryOperand(2), i.InputRegister(1));
+      __ movsx_b(eax, eax);
+      break;
+    }
+    case kAtomicCompareExchangeUint8: {
+      __ cmpxchg_b(i.MemoryOperand(2), i.InputRegister(1));
+      __ movzx_b(eax, eax);
+      break;
+    }
+    case kAtomicCompareExchangeInt16: {
+      __ cmpxchg_w(i.MemoryOperand(2), i.InputRegister(1));
+      __ movsx_w(eax, eax);
+      break;
+    }
+    case kAtomicCompareExchangeUint16: {
+      __ cmpxchg_w(i.MemoryOperand(2), i.InputRegister(1));
+      __ movzx_w(eax, eax);
+      break;
+    }
+    case kAtomicCompareExchangeWord32: {
+      __ cmpxchg(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 701 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8