[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 0f6d1c3a4a8ff7db2ed2a07436e3a96e542bbe16..0266dff9601e89c59742956d330e3984ef0f1452 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -1958,6 +1958,30 @@ 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: