[promises] Port ResolvePromise to TF

src/heap-symbols.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_SYMBOLS_H_
 #define V8_HEAP_SYMBOLS_H_
 
 #define INTERNALIZED_STRING_LIST(V)                                \
   V(anonymous_string, "anonymous")                                 \
   V(apply_string, "apply")                                         \
@@ skipping 135 matching lines @@
   V(source_url_string, "source_url")                               \
   V(stack_string, "stack")                                         \
   V(stackTraceLimit_string, "stackTraceLimit")                     \
   V(sticky_string, "sticky")                                       \
   V(strict_compare_ic_string, "===")                               \
   V(string_string, "string")                                       \
   V(String_string, "String")                                       \
   V(symbol_string, "symbol")                                       \
   V(Symbol_string, "Symbol")                                       \
   V(SyntaxError_string, "SyntaxError")                             \
+  V(then_string, "then")                                           \
   V(this_string, "this")                                           \
   V(throw_string, "throw")                                         \
   V(timed_out, "timed-out")                                        \
   V(timeZoneName_string, "timeZoneName")                           \
   V(toJSON_string, "toJSON")                                       \
   V(toString_string, "toString")                                   \
   V(true_string, "true")                                           \
   V(TypeError_string, "TypeError")                                 \
   V(type_string, "type")                                           \
   V(CompileError_string, "CompileError")                           \
@@ skipping 69 matching lines @@
 // Well-Known Symbols are "Public" symbols, which have a bit set which causes
 // them to produce an undefined value when a load results in a failed access
 // check. Because this behaviour is not specified properly as of yet, it only
 // applies to a subset of spec-defined Well-Known Symbols.
 #define WELL_KNOWN_SYMBOL_LIST(V)                           \
   V(has_instance_symbol, Symbol.hasInstance)                \
   V(is_concat_spreadable_symbol, Symbol.isConcatSpreadable) \
   V(to_string_tag_symbol, Symbol.toStringTag)
 
 #endif  // V8_HEAP_SYMBOLS_H_