[Atomics] Make Atomics.exchange a builtin using TF

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 309b7dca48ba3a0ffd00a7d9398f6d6707168aaf..ddd4901e76c86ea2e79eac182a74265eb09a3725 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -3505,6 +3505,9 @@ void Genesis::InitializeGlobal_harmony_sharedarraybuffer() {
                         Builtins::kAtomicsLoad, 2, true);
   SimpleInstallFunction(atomics_object, factory->InternalizeUtf8String("store"),
                         Builtins::kAtomicsStore, 3, true);
+  SimpleInstallFunction(atomics_object,
+                        factory->InternalizeUtf8String("exchange"),
+                        Builtins::kAtomicsExchange, 3, true);
 }