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

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 58213ac3ffd1d9bfed29f8dbe00ca0ce44645d12..9cbdac65e435a1b86ef574e31ebba14039616c37 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -72,12 +72,12 @@ DECLARE_FLAG(bool, trace_reload);
 DECLARE_FLAG(bool, write_protect_code);
 DECLARE_FLAG(bool, support_externalizable_strings);
 
-
 static const char* const kGetterPrefix = "get:";
 static const intptr_t kGetterPrefixLength = strlen(kGetterPrefix);
 static const char* const kSetterPrefix = "set:";
 static const intptr_t kSetterPrefixLength = strlen(kSetterPrefix);
 
+
 // A cache of VM heap allocated preinitialized empty ic data entry arrays.
 RawArray* ICData::cached_icdata_arrays_[kCachedICDataArrayCount];