[vm,compiler] Count DispatchTableCalls in call site count for inlining heuristics

TEST=ci

Change-Id: I820b2f6ff25bddea4ab27a6c9594e3e0bf9534a5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/404901
Commit-Queue: Alexander Markov <[email protected]>
Reviewed-by: Slava Egorov <[email protected]>

Author: alexmarkov

runtime/vm/compiler/backend/inliner.cc

@@ -190,7 +190,7 @@ class GraphInfoCollector : public ValueObject {
           instruction_count_ += current->ArgumentCount();
         }
         if (current->IsInstanceCall() || current->IsStaticCall() ||
-            current->IsClosureCall()) {
+            current->IsClosureCall() || current->IsDispatchTableCall()) {
           ++call_site_count_;
           continue;
         }