A64: Synchronize with r18147.

src/contexts.h

Index: src/contexts.h
diff --git a/src/contexts.h b/src/contexts.h
index 461c9dc6b714667f94af9909087abb245b2ca811..1b857c30207a04e0eecdaf7c8ca6345c3424ea7b 100644
--- a/src/contexts.h
+++ b/src/contexts.h
@@ -166,6 +166,7 @@ enum BindingFlags {
   V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \
   V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \
     error_message_for_code_gen_from_strings) \
+  V(RUN_MICROTASKS_INDEX, JSFunction, run_microtasks) \
   V(TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, JSFunction, \
     to_complete_property_descriptor) \
   V(DERIVED_HAS_TRAP_INDEX, JSFunction, derived_has_trap) \
@@ -178,7 +179,6 @@ enum BindingFlags {
     observers_begin_perform_splice) \
   V(OBSERVERS_END_SPLICE_INDEX, JSFunction, \
     observers_end_perform_splice) \
-  V(OBSERVERS_DELIVER_CHANGES_INDEX, JSFunction, observers_deliver_changes) \
   V(GENERATOR_FUNCTION_MAP_INDEX, Map, generator_function_map) \
   V(STRICT_MODE_GENERATOR_FUNCTION_MAP_INDEX, Map, \
     strict_mode_generator_function_map) \
@@ -317,6 +317,7 @@ class Context: public FixedArray {
     EMBEDDER_DATA_INDEX,
     ALLOW_CODE_GEN_FROM_STRINGS_INDEX,
     ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX,
+    RUN_MICROTASKS_INDEX,
     TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX,
     DERIVED_HAS_TRAP_INDEX,
     DERIVED_GET_TRAP_INDEX,
@@ -326,7 +327,6 @@ class Context: public FixedArray {
     OBSERVERS_ENQUEUE_SPLICE_INDEX,
     OBSERVERS_BEGIN_SPLICE_INDEX,
     OBSERVERS_END_SPLICE_INDEX,
-    OBSERVERS_DELIVER_CHANGES_INDEX,
     GENERATOR_FUNCTION_MAP_INDEX,
     STRICT_MODE_GENERATOR_FUNCTION_MAP_INDEX,
     GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX,