[compiler] Fix EmitTestAndCall for a complete call of a Smi method.

In rare circumstances we can generate a complete monomorphic
PolymorphicInstanceCall targeting a method of Smi class.

In this case we don't need to check anything - we can simply emit a
static call.

(This fixes a bug in the incorrect fix submitted earlier as
c67b9f2 - even if call is complete
we still need to check for a smi receiver if there are more possible
receiver classes)

Fixes #37019

Bug: 37019
Change-Id: If0250ba2811f00cc4fe595bf7cd03a7c0d820076
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103809
Reviewed-by: Vyacheslav Egorov <[email protected]>
Commit-Queue: Vyacheslav Egorov <[email protected]>

Author: mraleph

runtime/vm/compiler/backend/flow_graph_compiler.cc

@@ -2140,7 +2140,10 @@ void FlowGraphCompiler::EmitTestAndCall(const CallTargets& targets,
 
   if (smi_case != kNoCase) {
     Label after_smi_test;
-    if (!complete) {
+    // If the call is complete and there are no other possible receiver
+    // classes - then receiver can only be a smi value and we don't need
+    // to check if it is a smi.
+    if (!(complete && non_smi_length == 0)) {
       EmitTestAndCallSmiBranch(non_smi_length == 0 ? failed : &after_smi_test,
                                /* jump_if_smi= */ false);
     }