[heap, maglev] Add shared barrier for Maglev generated code

Maglev write barrier needs to use different page flag mask to also
call into the slow path of the barrier for old-to-shared pointers.

Bug: v8:11708
Change-Id: I9ff5ead0517e9682672452f9868b16fa0dd94be2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3834256Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Auto-Submit: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82549}

src/maglev/maglev-ir.cc

@@ -1581,9 +1581,10 @@ void StoreTaggedFieldWithWriteBarrier::GenerateCode(
          StoreTaggedFieldWithWriteBarrier* node) {
         ASM_CODE_COMMENT_STRING(code_gen_state->masm(),
                                 "Write barrier slow path");
-        __ CheckPageFlag(value, kScratchRegister,
-                         MemoryChunk::kPointersToHereAreInterestingMask, zero,
-                         return_label);
+        __ CheckPageFlag(
+            value, kScratchRegister,
+            MemoryChunk::kPointersToHereAreInterestingOrInSharedHeapMask, zero,
+            return_label);
 
         Register slot_reg = WriteBarrierDescriptor::SlotAddressRegister();
         RegList saved;