[torque] Move SourceTextModule flags definitions to Torque

This is a partial reland of https://crrev.com/c/v8/v8/+/2199640 .

Change-Id: I244174446c52b05e70042d7f4d03eb67a0c725b7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2216304Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#68028}

src/objects/module-inl.h

@@ -36,8 +36,9 @@ ACCESSORS(Module, exception, Object, kExceptionOffset)
 SMI_ACCESSORS(Module, status, kStatusOffset)
 SMI_ACCESSORS(Module, hash, kHashOffset)
 
-BOOL_ACCESSORS(SourceTextModule, flags, async, kAsyncBit)
-BOOL_ACCESSORS(SourceTextModule, flags, async_evaluating, kAsyncEvaluatingBit)
+BOOL_ACCESSORS(SourceTextModule, flags, async, AsyncBit::kShift)
+BOOL_ACCESSORS(SourceTextModule, flags, async_evaluating,
+               AsyncEvaluatingBit::kShift)
 ACCESSORS(SourceTextModule, async_parent_modules, ArrayList,
           kAsyncParentModulesOffset)
 ACCESSORS(SourceTextModule, top_level_capability, HeapObject,

src/objects/source-text-module.h

@@ -7,6 +7,7 @@
 
 #include "src/objects/module.h"
 #include "src/objects/promise.h"
+#include "torque-generated/bit-fields-tq.h"
 
 // Has to be the last include (doesn't have include guards):
 #include "src/objects/object-macros.h"
@@ -91,8 +92,7 @@ class SourceTextModule
   inline void DecrementPendingAsyncDependencies();
 
   // Bits for flags.
-  static const int kAsyncBit = 0;
-  static const int kAsyncEvaluatingBit = 1;
+  DEFINE_TORQUE_GENERATED_SOURCE_TEXT_MODULE_FLAGS()
 
   // async_evaluating, top_level_capability, pending_async_dependencies, and
   // async_parent_modules are used exclusively during evaluation of async

src/objects/source-text-module.tq

@@ -4,6 +4,11 @@
 
 type SourceTextModuleInfo extends FixedArray;
 
+bitfield struct SourceTextModuleFlags extends uint31 {
+  async: bool: 1 bit;
+  async_evaluating: bool: 1 bit;
+}
+
 @generateCppClass
 extern class SourceTextModule extends Module {
   // The code representing this module, or an abstraction thereof.
@@ -39,7 +44,7 @@ extern class SourceTextModule extends Module {
   // The number of currently evaluating async dependencies of this module.
   pending_async_dependencies: Smi;
 
-  flags: Smi;
+  flags: SmiTagged<SourceTextModuleFlags>;
 }
 
 @generateCppClass