PPC/s390: [heap, baseline] Implement shared write barrier for baseline compiler

Port 805df68f

Original Commit Message:

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

R=dinfuehr@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: I00c179ac04b74b1196951ae4d8c868d312d5a856
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3834633
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82543}

src/codegen/ppc/macro-assembler-ppc.cc

@@ -836,7 +836,8 @@ void MacroAssembler::RecordWrite(Register object, Register slot_address,
 
   CheckPageFlag(value,
                 value,  // Used as scratch.
-                MemoryChunk::kPointersToHereAreInterestingMask, eq, &done);
+                MemoryChunk::kPointersToHereAreInterestingOrInSharedHeapMask,
+                eq, &done);
   CheckPageFlag(object,
                 value,  // Used as scratch.
                 MemoryChunk::kPointersFromHereAreInterestingMask, eq, &done);

src/codegen/s390/macro-assembler-s390.cc

@@ -1071,7 +1071,8 @@ void MacroAssembler::RecordWrite(Register object, Register slot_address,
 
   CheckPageFlag(value,
                 value,  // Used as scratch.
-                MemoryChunk::kPointersToHereAreInterestingMask, eq, &done);
+                MemoryChunk::kPointersToHereAreInterestingOrInSharedHeapMask,
+                eq, &done);
   CheckPageFlag(object,
                 value,  // Used as scratch.
                 MemoryChunk::kPointersFromHereAreInterestingMask, eq, &done);