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

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
diff --git a/runtime/vm/dart.cc b/runtime/vm/dart.cc
index 413dad3b8e021c43b6268efe394575c276f6b56f..579691ec6714e39e4bd61ad73e82ef08cacc7460 100644
--- a/runtime/vm/dart.cc
+++ b/runtime/vm/dart.cc
@@ -95,6 +95,7 @@ static void CheckOffsets() {
   CHECK_OFFSET(Thread::stack_limit_offset(), 4);
   CHECK_OFFSET(Thread::object_null_offset(), 36);
   CHECK_OFFSET(SingleTargetCache::upper_limit_offset(), 14);
+  CHECK_OFFSET(Isolate::object_store_offset(), 28);
   NOT_IN_PRODUCT(CHECK_OFFSET(sizeof(ClassHeapStats), 120));
 #endif
 #if defined(TARGET_ARCH_MIPS)
@@ -104,6 +105,7 @@ static void CheckOffsets() {
   CHECK_OFFSET(Thread::stack_limit_offset(), 4);
   CHECK_OFFSET(Thread::object_null_offset(), 36);
   CHECK_OFFSET(SingleTargetCache::upper_limit_offset(), 14);
+  CHECK_OFFSET(Isolate::object_store_offset(), 28);
   NOT_IN_PRODUCT(CHECK_OFFSET(sizeof(ClassHeapStats), 120));
 #endif
 #if defined(TARGET_ARCH_ARM64)
@@ -113,6 +115,7 @@ static void CheckOffsets() {
   CHECK_OFFSET(Thread::stack_limit_offset(), 8);
   CHECK_OFFSET(Thread::object_null_offset(), 72);
   CHECK_OFFSET(SingleTargetCache::upper_limit_offset(), 28);
+  CHECK_OFFSET(Isolate::object_store_offset(), 56);
   NOT_IN_PRODUCT(CHECK_OFFSET(sizeof(ClassHeapStats), 208));
 #endif
 #undef CHECK_OFFSET