[ic] Remove unreachable %Unreachable.

R=ishell@chromium.org

Bug: v8:7310
Change-Id: Ibdf4c0c5a53de88d492668786734be08420df90e
Reviewed-on: https://chromium-review.googlesource.com/934342Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51506}

src/ic/ic.cc

@@ -2367,11 +2367,6 @@ RUNTIME_FUNCTION(Runtime_ElementsTransitionAndStoreIC_Miss) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_Unreachable) {
-  UNREACHABLE();
-}
-
-
 RUNTIME_FUNCTION(Runtime_StoreCallbackProperty) {
   Handle<JSObject> receiver = args.at<JSObject>(0);
   Handle<JSObject> holder = args.at<JSObject>(1);

src/runtime/runtime.h

@@ -680,8 +680,7 @@ namespace internal {
   F(StoreGlobalIC_Miss, 4, 1)                \
   F(StoreGlobalIC_Slow, 5, 1)                \
   F(StoreIC_Miss, 5, 1)                      \
-  F(StorePropertyWithInterceptor, 5, 1)      \
-  F(Unreachable, 0, 1)
+  F(StorePropertyWithInterceptor, 5, 1)
 
 #define FOR_EACH_INTRINSIC_RETURN_OBJECT(F) \
   FOR_EACH_INTRINSIC_IC(F)                  \