Recognize and optimize a.runtimeType == b.runtimeType pattern.

runtime/vm/compiler.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 816 matching lines @@
 
           // Use propagated class-ids to create more inlining opportunities.
           optimizer.ApplyClassIds();
           DEBUG_ASSERT(flow_graph->VerifyUseLists());
 
           FlowGraphInliner inliner(flow_graph,
                                    &inline_id_to_function,
                                    &inline_id_to_token_pos,
                                    &caller_inline_id,
                                    use_speculative_inlining,
-                                   NULL);
+                                   /*inlining_black_list=*/ NULL,
+                                   /*precompiler=*/ NULL);
           inliner.Inline();
           // Use lists are maintained and validated by the inliner.
           DEBUG_ASSERT(flow_graph->VerifyUseLists());
         }
 
         // Propagate types and eliminate more type tests.
         FlowGraphTypePropagator::Propagate(flow_graph);
         DEBUG_ASSERT(flow_graph->VerifyUseLists());
 
         {
@@ skipping 587 matching lines @@
   }
   UNREACHABLE();
   return Error::null();
 }
 
 
 RawError* Compiler::CompileFunction(Thread* thread,
                                     const Function& function) {
 #ifdef DART_PRECOMPILER
   if (FLAG_precompiled_mode) {
-    return Precompiler::CompileFunction(thread, thread->zone(), function);
+    return Precompiler::CompileFunction(
+        /* precompiler = */ NULL, thread, thread->zone(), function);
   }
 #endif
   Isolate* isolate = thread->isolate();
 NOT_IN_PRODUCT(
   VMTagScope tagScope(thread, VMTag::kCompileUnoptimizedTagId);
   TIMELINE_FUNCTION_COMPILATION_DURATION(thread, "CompileFunction", function);
 )  // !PRODUCT
 
   if (!isolate->compilation_allowed()) {
     FATAL3("Precompilation missed function %s (%s, %s)\n",
@@ skipping 855 matching lines @@
 
 
 bool BackgroundCompiler::IsDisabled() {
   UNREACHABLE();
   return true;
 }
 
 #endif  // DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart