[Atomics] Make Atomics.compareExchange a builtin using TF

src/compiler/ia32/code-generator-ia32.cc

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index 7243d621c3d210dff4dacc58f004e324fcc4e4b9..68d33f9f5edb5b034f2b173f259ad1ef784e0bff 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -1992,6 +1992,30 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       __ 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: