[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 ac3ca994b41838f5558bbb4ba5098381dcc824ab..01feb4737902c413a0da8039ef0896a76c85d417 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -3737,6 +3737,9 @@ 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() {