[runtime] Remove the unused weird %Likely and %Unlikely intrinsics.

src/runtime/runtime-internal.cc

Index: src/runtime/runtime-internal.cc
diff --git a/src/runtime/runtime-internal.cc b/src/runtime/runtime-internal.cc
index 4cfa1286c785b0da83437d142aaae83e324f2c53..bae20d5bd0ecf277003eb7525190bbe710e0dd1d 100644
--- a/src/runtime/runtime-internal.cc
+++ b/src/runtime/runtime-internal.cc
@@ -371,18 +371,6 @@ RUNTIME_FUNCTION(Runtime_IncrementStatsCounter) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_Likely) {
-  DCHECK(args.length() == 1);
-  return args[0];
-}
-
-
-RUNTIME_FUNCTION(Runtime_Unlikely) {
-  DCHECK(args.length() == 1);
-  return args[0];
-}
-
-
 RUNTIME_FUNCTION(Runtime_HarmonyToString) {
   // TODO(caitp): Delete this runtime method when removing --harmony-tostring
   return isolate->heap()->ToBoolean(FLAG_harmony_tostring);