[Atomics] Make Atomics.exchange a builtin using TF

src/js/harmony-atomics.js

Index: src/js/harmony-atomics.js
diff --git a/src/js/harmony-atomics.js b/src/js/harmony-atomics.js
index bfbf0c505e54bab3ff298f370de8d54c903114af..4b34e1222c182414124adbd1947f90b75408b96d 100644
--- a/src/js/harmony-atomics.js
+++ b/src/js/harmony-atomics.js
@@ -93,13 +93,6 @@ function AtomicsXorJS(ia, index, value) {
   return %_AtomicsXor(ia, index, value);
 }
 
-function AtomicsExchangeJS(ia, index, value) {
-  CheckSharedIntegerTypedArray(ia);
-  index = ValidateIndex(index, %_TypedArrayGetLength(ia));
-  value = TO_NUMBER(value);
-  return %_AtomicsExchange(ia, index, value);
-}
-
 function AtomicsIsLockFreeJS(size) {
   return %_AtomicsIsLockFree(size);
 }
@@ -144,7 +137,6 @@ utils.InstallFunctions(Atomics, DONT_ENUM, [
   "and", AtomicsAndJS,
   "or", AtomicsOrJS,
   "xor", AtomicsXorJS,
-  "exchange", AtomicsExchangeJS,
   "isLockFree", AtomicsIsLockFreeJS,
   "wait", AtomicsWaitJS,
   "wake", AtomicsWakeJS,