[Atomics] Make Atomics.compareExchange a builtin using TF

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index f76aa35bbea0674adbc27d5b3da24a21c7fae67d..2c62a6618cf553808387cc3789c61f00ee29471d 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -3729,6 +3729,9 @@ void Genesis::InitializeGlobal_harmony_sharedarraybuffer() {
   SimpleInstallFunction(atomics_object,
                         factory->InternalizeUtf8String("exchange"),
                         Builtins::kAtomicsExchange, 3, true);
+  SimpleInstallFunction(atomics_object,
+                        factory->InternalizeUtf8String("compareExchange"),
+                        Builtins::kAtomicsCompareExchange, 4, true);
 }
 
 void Genesis::InitializeGlobal_harmony_array_prototype_values() {